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"USB Device Not Recognized"
I have searched for so long trying to figure out what's wrong. I'm out of idea's on how to fix it, nothing will recognize my Evo.
Tried on 4 different computers, two of them running 7, one running xp, and last running vista, all say the same thing, computers not the problem.
Downloaded htc sync, disabled/enabled usb debugging, restarted the phone many times, restarted computers, and even changed the default usb connection to HDD and HTC sync.
I rooted using the idiot proof guide and used the Sprint Rom he linked in the guide. Would love some help. Thanks!
Try downloading the auto sync app in market
And let me know what happens.
Sent from my PC36100 using XDA App
b1indsided said:
Try downloading the auto sync app in market
And let me know what happens.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
Just tried that and still not recognizing it.
Which HTC Sync did you try? I think the latest is 2.0.40
http://www.htc.com/us/support/evo-sprint/downloads/
set the EVO connection type to HTC SYNC and USB DEBUGGING ENABLED.
Assuming you've used ADB, what response you you get from
ADB DEVICES at the command prompt?
you should get something like
C:\>adb devices
adb server is out of date
* daemon started successfully *
List of devices attached
HT05EHL10353 device
and we will know you have a good physical connection to the computers. If it doesnt show up, try a different USB cable....
also can try this helpful link...
http://kenshinjeff.18jan.us/2009/06/12/adb-error-device-not-found-android-phone/
or here
http://htcevohacks.com/htc-evo-hacks/how-to-install-android-sdk-and-adb-drivers-for-htc-evo-4g/
stratman71 said:
Which HTC Sync did you try? I think the latest is 2.0.40
set the EVO connection type to HTC SYNC and USB DEBUGGING ENABLED.
Assuming you've used ADB, what response you you get from
ADB DEVICES at the command prompt?
you should get something like
C:\>adb devices
adb server is out of date
* daemon started successfully *
List of devices attached
HT05EHL10353 device
and we will know you have a good physical connection to the computers. If it doesnt show up, try a different USB cable....
also can try this helpful link...
Click to expand...
Click to collapse
Thanks for the help! I checked for my device in ADB and it does not list it, so i guess my cable is probably bad. I'll go out and buy another and hopefully that fixes the problem.
guesswhatimevan said:
"USB Device Not Recognized"
I rooted using the idiot proof guide and used the Sprint Rom he linked in the guide. Would love some help. Thanks!
Click to expand...
Click to collapse
Did you do the 3 click method?
guesswhatimevan said:
Thanks for the help! I checked for my device in ADB and it does not list it, so i guess my cable is probably bad. I'll go out and buy another and hopefully that fixes the problem.
Click to expand...
Click to collapse
Probably not the cable, follow this guide before buying another cable.
http://htcevohacks.com/htc-evo-hacks/how-to-install-android-sdk-and-adb-drivers-for-htc-evo-4g/
Philosuffer said:
Probably not the cable, follow this guide before buying another cable.
http://htcevohacks.com/htc-evo-hacks/how-to-install-android-sdk-and-adb-drivers-for-htc-evo-4g/
Click to expand...
Click to collapse
When i connect my phone in recovery mode, it still just says device not recognized, so i can't really do that.
Sorry but bump, i relly need help with this.
It still says unknown device when i try to connect my phone in recovery mode.
Go into your computers device manager and uninstall the device and htc sync, then reinstall sync and make sure usb debugging is on then plug it in
Edit: sorry, go into the device manager with it plugged in. if its not there (should be a yellow or red triangle next to it or neat the to as a HID) them it could be your cable or phones port.
Sent from my Evo 4G via the XDA app
Mast3rpyr0 said:
Go into your computers device manager and uninstall the device and htc sync, then reinstall sync and make sure usb debugging is on then plug it in
Edit: sorry, go into the device manager with it plugged in. if its not there (should be a yellow or red triangle next to it or neat the to as a HID) them it could be your cable or phones port.
Sent from my Evo 4G via the XDA app
Click to expand...
Click to collapse
Just tried that and it's a no go, still the same problem, Also tried another cable today and that didn't help either.
I have light leakeage at the bottom of my phone, so i think i'm going to take it in for that and just get a replacement.
guesswhatimevan said:
When i connect my phone in recovery mode, it still just says device not recognized, so i can't really do that.
Click to expand...
Click to collapse
I think you need to pay closer attention to the guide, because this statement makes no sense in reference to the guide.
The guide is helping you install ADB drivers, you don't need to do anything in ADB while your phone is in recovery in that guide.
Could be wrong, but I'm still fairly certain that the guide will fix your issue, because I had the same problem.
It's as simple as you do not have the correct, or any ADB drivers, therefore your phone is not showing up as a device under ADB. Once you have the proper drivers installed, your device will show up.
Philosuffer said:
I think you need to pay closer attention to the guide, because this statement makes no sense in reference to the guide.
The guide is helping you install ADB drivers, you don't need to do anything in ADB while your phone is in recovery in that guide.
Could be wrong, but I'm still fairly certain that the guide will fix your issue, because I had the same problem.
It's as simple as you do not have the correct, or any ADB drivers, therefore your phone is not showing up as a device under ADB. Once you have the proper drivers installed, your device will show up.
Click to expand...
Click to collapse
I followed the simple guide step by step.
When i boot into recovery mode i end up with this in the picture.
His recovery mode shows an Evo with a little exclamation mark next to it, i'm guessing what i got is still recovery mode. But still if i plug my phone in my computer still says unknown device, so i can't install ADB drivers.
guesswhatimevan said:
I followed the simple guide step by step.
When i boot into recovery mode i end up with this in the picture.
His recovery mode shows an Evo with a little exclamation mark next to it, i'm guessing what i got is still recovery mode. But still if i plug my phone in my computer still says unknown device, so i can't install ADB drivers.
Click to expand...
Click to collapse
You just have a different recovery. Once you are in recovery, you don't need to do anything else on your phone specifically.
Instead, connect your phone to your PC via USB if it isn't already and open up device manager on your PC and follow the rest of the guide.
Edit: Where does it say unknown device? In Device Manager?
Philosuffer said:
You just have a different recovery. Once you are in recovery, you don't need to do anything else on your phone specifically.
Instead, connect your phone to your PC via USB if it isn't already and open up device manager on your PC and follow the rest of the guide.
Edit: Where does it say unknown device? In Device Manager?
Click to expand...
Click to collapse
It shows up in usb controllers instead of other devices as he shows in the guide. If i try to update the driver it just tells me it's already up to date.
>Sorry yea it does say unknown device in device manager.
Gotta bump, would really love to just fix this instead of driving 30 mins to a sprint store.
So i followed the guide for installing apb drivers, but even in recovery mode my phone still shows up as unknown device in device manager.
Ok, well I just ran into this myself on my secondary computer. Have you tried a different USB port on your PC?
My front ones were giving me unknown device, but as soon as I plugged it into one of the ports on the back of the mobo ADB showed right up in device manager.
Factory reset it and get it exchanged.I belief is the SD card failure issue.
Sent from my PC36100 using XDA App
I have the same problem and posted this question on 3 forums including the HTC support forum and nobody has been able to find the correct solution.
I know the cable and the port is good because I can connect my Samsung Moment to it and it works perfectly. On the Evo, I've downloaded the latest HTC Sync from the official HTC site, tried the one on the microsd card, checked and un-checked USB debugging, and still it doesn't connect.
The Evo won't connect to my Win 7 computer at home, Win XP at work, but it will connect to my daughters computer which is running Win XP also (all 32 bit).
I bought this Evo from Best Buy exactly 28 days ago today. Do they give you 30 days to return it, or is that only the Sprint store?
They do give u 30 day trial.go get it exchanged or...........
Sent from my PC36100 using XDA App
My mac is unable to detect my phone since I flashed Cyan 6 Test 8 Koush, as such I am unable to use adb. Given that I use a mac I assume this is not a driver issue. Phone is able to recharge via USB and USB debugging is enabled. I have found this issue (USB Brick) for the desire on this site but it involves flashing a rom unique to that device. Any ideas on how to resolve issue? Other than USB brick issue, everything is in order.
My card reader is able to read SD card and I have copied to my HD, so I assume issue is with USB on phone.
The only thing I can think of is that your phone somehow got stuck on "Charge Only" mode. In the stock version you can go to Settings, Connect to PC and then change some options there... I do not use this rom though so I'm sorry I can't help you other any further (I'm sure you likely already knew about the above info... if no one responds to you with an answer within a couple days I'd consider asking the Indian Prince of Roms himself... and I know he uses a Mac).
I assume you are mounting your system in recovery while trying to get adb?
Sent from my Incredible using Tapatalk
Yes. Device is not found. Can't view contents via finder either. When I pop out SD card and insert into reader contents are visible.
Sent from my Incredible using XDA App
http://androidforums.com/all-things...16-how-revert-back-earlier-version-hboot.html
This should also fix usb bricks.
Referencing:
http://forum.xda-developers.com/showthread.php?t=691639
Obviously you will need to try it from a terminal emulator.
I recently had the same issue - on a PC - where my CM6 test 8 install would charge but not register as a USB device and give me device malfunction warning messages. Turns out it was a problem with a non-HTC branded micro USB cable I was using.
Odd thing is it worked fine for a month or so, then decided to not work anymore out of any USB port. Switching over to the original cable fixed the problem. Now the other cable is relegated to the stock charger.
This should also fix usb bricks.
Referencing:
Obviously you will need to try it from a terminal emulator.[/QUOTE]
Thank you. I am on the road, so I won't be able to implement your solution until later. The procedure you outlined seems simple enough. I will reread. Is it ok if I email you with any questions, or would you prefer that I address my questions via this forum?
tdiman said:
I recently had the same issue - on a PC - where my CM6 test 8 install would charge but not register as a USB device and give me device malfunction warning messages. Turns out it was a problem with a non-HTC branded micro USB cable I was using.
Odd thing is it worked fine for a month or so, then decided to not work anymore out of any USB port. Switching over to the original cable fixed the problem. Now the other cable is relegated to the stock charger.
Click to expand...
Click to collapse
Funny thing is that I did not notice the problem until I changed cables. I was using a third party w/no problems, problem only surfaced when I used original cable. Hopefully I will have same luck as you, if not, adrynalyne posted near idiot proof instructions. I just hope that I am brighter than your average idiot, no promises.
adrynalyne, if my hboot is .77 could I simply flash PBI131.img to revert back to original? If not, could I use terminal emulator on my phone to execute necessary commands?
Answer from adrynalyne was "Well, yeah. the PB31IMG.zip should work, as long as it lets you. The other method would need to be done if it won't."
I was able to resolve the problem by switching usb cord to a 3rd party from htc, go figure. Nevertheless, the USB issue has been cited in other forums and if anybody else runs into the problem, follow directions above, i.e. follow links.
TY to all who gave me advice, esp. adrynalyne.
hey, umm.. im having a similar problem. when i try to plug in my droid incredible with the leaked 8/1 froyo rom, nothing comes up on my PC, i am able to acces my sd card by going to computer, and then clicking my sd card. but when i did this, i also noticed that there was a new cd drive, which comes from my phone. does anyone know if this is a usb brick?
Apparently there is a vzw ISO. There are instructions on how to remove in another post. Search USB bricked. I can't post links otherwise I would.
Sent from my Incredible using XDA App
Well, i tired it, but it didnt fix my auto start problem... and now, the cd drive doeant have a name, its juat cd drive:f
I'm running cyanogenmod 7 on my evo 4g and when I plug it into a computer it only charges and never prompts me if I want to connect as a disk drive. It used to but now it just stopped. I had a backup of my rom so I put it on my girlfriends evo and hers still connected to the pc like normal but mine will not give me the option to hook up through USB. My computer says unknown device. Any help would be great. I can provide more info if you need.
More info. It gives me code 43 in windows 7. I was able to hook it up in xp but when I tried doing anything it no longer was able to detect the phone. I did a factory reset and it still doesn't work. I'm at a complete loss. I feel the only thing left to do is revert completely back to stock losing root and starting from scratch.
perhaps try completely uninstalling the device from windows in Device Manager. Then plug it in again and let it re-install the drivers
sitlet said:
perhaps try completely uninstalling the device from windows in Device Manager. Then plug it in again and let it re-install the drivers
Click to expand...
Click to collapse
I've tried that on two different computers with windows 7. My gfs fone reads fine with the exact same rom but mine wont.
It seems like the drivers on the phone are corrupted or something. At one point I found a forum that suggested to turn off bluetooth and a few other things. I decided to see if turning off my wifi would do anything and finally my phone showed the usb debugging notification and the mount as usb notification but it wouldn't mount so I restarted my phone and now it's back to doing nothing but charge the phone.
The only difference between the two phones is the rom then? Perhaps make a backup and flash a different rom or re-flash your current rom to see if that helps
sitlet said:
The only difference between the two phones is the rom then? Perhaps make a backup and flash a different rom or re-flash your current rom to see if that helps
Click to expand...
Click to collapse
I actually took a backup of my rom and put it on my gfs phone and hers worked. we had the exact same rom. I will try installing a different rom however and i'll let you know what happens.
Okay so I had a back up of sinister rom so I restored it and now it asks me if I want to connect as a usb device and so I do and my computer still says usb device not recognized or whatever.
Wow so I tried a backup of sinister rom that I had and suddenly it asked if i wanted to connect as a disk drive but windows was still saying usb device not recognized. I reverted all the way back to stock losing root privileges and it still doesn't work. It appears to me that it is a hardware problem. I don't know what else to do.
ok, so I hooked my phone up to a computer with ubuntu on it and my phone showed up but then when I went to explore the sd card it said permission denied. Then I hooked it up in windows 7 and it showed unknown device under universal serial bus controllers(as usual) but it also had it under modem, which is what I want.
Okay, got it working on this computer. After plugging the phone in several times it still said device not recognized. I have also been pushing ##data# and it was saying the same thing. I decided to shut my phone off one last time and when I hooked it up i pushed ##diag# and now it works. ****ing stupid. Glad it's working now.
UPDATE: Now all of the drivers install when I plug the phone in except the HTC DIAG doesn't appear even when i enter diag mode on the phone. this is the only driver i need installed but i can't install it because the computer isn't picking up that part of the device....This is getting irritating.
Turns out my port is ****ed up. I'm gonna have to order a new one and replace it.
I connected my SG2 via USB cable to my PC and started seeing this error
"One of the USB devices attached to this computer has malfunctioned and Windows does not recognize it. For assistance in solving this problem, click this message."
I have tried everything from changing cables/PCs/enabling/disabling USB debugging to *#7284#, and none of them work ...
Is the device bricked, is there any hope of revival..please help i got this phone myself paying $400
Does your phone turn on and work and a connection to PC the only problem? If so your not bricked...you prolly need to install the drivers in order for your PC to recognize it so install kies on your PC
Sent from my SGH-T989 using XDA App
Yes phone turns on, charges through the port...just that it is not recognized by the PC....what could be wrong?
As I said previously you probably need to add the drivers on your PC install kies on your PC
Sent from my SGH-T989 using XDA App
Make sure you use one of your rear usb ports also. I had an issue with drivers installing in a front usb port.
Phew it turns out to be the samsung driver..I believe kies update must have corrupted and stopped the pc from recognizing the phone....
seshsud said:
I connected my SG2 via USB cable to my PC and started seeing this error
"One of the USB devices attached to this computer has malfunctioned and Windows does not recognize it. For assistance in solving this problem, click this message."
I have tried everything from changing cables/PCs/enabling/disabling USB debugging to *#7284#, and none of them work ...
Is the device bricked, is there any hope of revival..please help i got this phone myself paying $400
Click to expand...
Click to collapse
The definition of "bricked" is having a really expensive
... brick. It means your phone doesn't turn on no matter what you do to it (short of a JIG and that's not guaranteed) the "USB device not recognized thing" is a problem w many windows devices my vista computer does it all the time and I just switch ports.
Sent from my SGH-T989
I had this problem. tried everything and never got my phone to connect toy laptop. What did you do?
Sent from my SGH-T989 using Tapatalk
Having same/similar issue
Hey, was there every a solution found for this?
I'm having basically the same problem...using the cable that came with my phone, and have installed Kies (fresh). I have tried toggling multiple settings. I tried uninstalling kies and reinstalling. I tried using pdanet for the driver. I have tried a few different roms, as well: Darkside 2.4, 2.5.1, and gingersnap 1.21. All have had the same result.
When I plug the phone in, it beeps (charging) but no notification for usb settings (disk drive, sync, etc). On my computer, it pops up "USB Device Not Recognized" and says the device has malfunctioned, etc, same as OP.
In Device Manager, it shows under USB as "Unknown Device".
I have tried this with two Windows 7 laptops, and a Windows Server 2008 R2 desktop. Also tried with a different cable. This cable was able to transfer data from an external hard drive today, so I doubt anything is wrong with it.
Any help is greatly appreciated!
Chino9656 said:
Hey, was there every a solution found for this?
I'm having basically the same problem...using the cable that came with my phone, and have installed Kies (fresh). I have tried toggling multiple settings. I tried uninstalling kies and reinstalling. I tried using pdanet for the driver. I have tried a few different roms, as well: Darkside 2.4, 2.5.1, and gingersnap 1.21. All have had the same result.
When I plug the phone in, it beeps (charging) but no notification for usb settings (disk drive, sync, etc). On my computer, it pops up "USB Device Not Recognized" and says the device has malfunctioned, etc, same as OP.
In Device Manager, it shows under USB as "Unknown Device".
I have tried this with two Windows 7 laptops, and a Windows Server 2008 R2 desktop. Also tried with a different cable. This cable was able to transfer data from an external hard drive today, so I doubt anything is wrong with it.
Any help is greatly appreciated!
Click to expand...
Click to collapse
Well I had the same problem with a new sgs2 i got witb the warranty. I even made a post about it. Tried everything and nothing fixed it. Had to do another warranty exchange
Sent from Flip's SGS2
Did you try the drivers separate first or Mtp mode
Sent from my revolutionized Samsung infuse
I tried without the drivers, and went to wireless and network > USB utilities. The only option in there, however, is "Connect storage to PC". If I try that, then plug it in, the phone acts like I hit the back/undo button. It doesn't show that anything is connected, nor does it give any other options. At this point on the computer, I get the "USB device not recognized" error.
This happened before installing Kies/Drivers, and still happens after installing drivers and kies.
try another usb cable
i had the exact same error, and it ended up being a good USB cable that went south
I will try a different cable when I get home - Have a month old cable for a mytouch 4g that I know works.
Okay, I tried it with the other cable, on a desktop in the rear port. same thing...Phone start to charge, and I get the error that the device malfunctioned, yada yada.
Any other ideas? Should I try to connect in Download mode?
Alrighty, so in the end, I ended up completely unroting, using terminal emulator to remove superuser.apk, busybox, and su and putting right back to read only. Then in CWM, flashed a stock 2.3.5 ROM (Zedomax). However, I now have the 2.3.5 ROM and the 2.3.6 KL1 Kernel...
I'm planning to return to Tmobile/Samsung - will the kernel and rom versions not matching be a huge red flag??
Any help is appreciated. I have tried to flash the 2.3.5 kernel, but I always get an error that it's not signed/verified.
Ideas?
I was hoping to grab the 2.3.6 OTA update, but it says there is no firmware update. Is there an update file I can put on the SD card and update using the stock recovery?
UPDATE:
I called T-Mobile Customer Service today, and went through the "troubleshooting" with them again. They ended up sending me a new one, overnight. They didn't ask anything about doing anything custom with it like rooting or other modifications.
I'm not sure if it made a difference, but I'm within 90 days, and also have the "best" insurance/warranty coverage through T-Mobile, and whoever their insurance provider is that I signed up for when I bought the phone.
Final charge is for $5, which I was told is some kind of fee from Samsung, but will appear on my bill.
Anyway, not too bad. Can't wait to get rid of touchwiz again when I get the new phone!
Chino9656 said:
Alrighty, so in the end, I ended up completely unroting, using terminal emulator to remove superuser.apk, busybox, and su and putting right back to read only. Then in CWM, flashed a stock 2.3.5 ROM (Zedomax). However, I now have the 2.3.5 ROM and the 2.3.6 KL1 Kernel...
I'm planning to return to Tmobile/Samsung - will the kernel and rom versions not matching be a huge red flag??
Any help is appreciated. I have tried to flash the 2.3.5 kernel, but I always get an error that it's not signed/verified.
Ideas?
I was hoping to grab the 2.3.6 OTA update, but it says there is no firmware update. Is there an update file I can put on the SD card and update using the stock recovery?
UPDATE:
I called T-Mobile Customer Service today, and went through the "troubleshooting" with them again. They ended up sending me a new one, overnight. They didn't ask anything about doing anything custom with it like rooting or other modifications.
I'm not sure if it made a difference, but I'm within 90 days, and also have the "best" insurance/warranty coverage through T-Mobile, and whoever their insurance provider is that I signed up for when I bought the phone.
Final charge is for $5, which I was told is some kind of fee from Samsung, but will appear on my bill.
Anyway, not too bad. Can't wait to get rid of touchwiz again when I get the new phone!
Click to expand...
Click to collapse
FYI, I just went through the same thing. Decided to finally root my phone after owning it for 2 weeks.
Phone nor the phone would recognize USB data, but would charge. Tried another cable and no luck.
Rebooted the phone. Works like a charm now.
So my phone was mounting fine on my pc, and then all of a sudden it wasn't. My Nexus 7 still mounts properly and accepts developer commands, but the m8 won't (yes developer settings is on).
I tried wiping and flashing a rom clean and it still doesn't work, charges fine though. Any advice?
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I'm having the same issue. Stock non rooted and it will not connect. I have tried it on other computers cables ports everything.
Art2Fly said:
So my phone was mounting fine on my pc, and then all of a sudden it wasn't. My Nexus 7 still mounts properly and accepts developer commands, but the m8 won't (yes developer settings is on).
I tried wiping and flashing a rom clean and it still doesn't work, charges fine though. Any advice?
Click to expand...
Click to collapse
You might try a different cord.
Open Device Manager in Windows and then plug the phone in. Do you see it in the list with a little yellow triangle? Do you see Android USB Devices listed?
OP after literally messing with various driver files, 8 usb ports and 2 laptops, I dug out my old box of cables and found a taped up, on its last limb OEM HTC EVO 4g (not lte the original) cable. This thing has been through the ringer. But its exactly what It needed. I figured with the 3 cable I had already tried this wasn't the issue, but have you tried using an OEM cable? I guess that is all that works. Good Luck
beamer1341 said:
OP after literally messing with various driver files, 8 usb ports and 2 laptops, I dug out my old box of cables and found a taped up, on its last limb OEM HTC EVO 4g (not lte the original) cable. This thing has been through the ringer. But its exactly what It needed. I figured with the 3 cable I had already tried this wasn't the issue, but have you tried using an OEM cable? I guess that is all that works. Good Luck
Click to expand...
Click to collapse
Still trying to get it to work, have tried 4 cables myself. I might just end up having to return the phone.... Fastboot works in bootloader
Art2Fly said:
Still trying to get it to work, have tried 4 cables myself. I might just end up having to return the phone.... Fastboot works in bootloader
Click to expand...
Click to collapse
Uninstall all HTC drivers and HTC Sync. Then connect the phone. DO NOT choose the option to automatically install any drivers.
Open Device Manager, find the phone. Select the option to manually pick the driver, and select the generic MTP device driver.
This is what worked for me, after countless attempts at re-installing various HTC drivers, different cables and ports, etc.
Bump. Still looking for answer to this. I have RUU'ed both to Sense and Google Phone editions and the problem still persists, the phone does not detect its connected to a computer and change to mtp accordingly. Only way I was able to get the RUU in there was through fastboot, which is again the only time I can access the phone through usb. Adb is no luck in either android or recovery.
Art2Fly said:
Bump. Still looking for answer to this. I have RUU'ed both to Sense and Google Phone editions and the problem still persists, the phone does not detect its connected to a computer and change to mtp accordingly. Only way I was able to get the RUU in there was through fastboot, which is again the only time I can access the phone through usb. Adb is no luck in either android or recovery.
Click to expand...
Click to collapse
Have you tried revoking the USB debugging authorization and then accepting the RSA fingerprint key again when connecting to PC?
Obviously it can't be an USB cable problem if you can connect to it in bootloader mode and use fastboot commands.
To clarify, the phone just charges when connected, it does not detect that it is connected to PC so debugging doesn't even trigger, neither does mtp. I don't even get the slow charging notification
Does it do the same when you plug it in and reboot the computer to "pick up" during boot up process? Or if you run a live CD? I never had an issue like that with my phone but I did have a similar problem with the USB external blu ray drive I bought some time ago. The pc just didn't detect it at all not on any of the ports until I rebooted my PC with the drive already plugged it and for some reason it picked it up. <Not a solution as I don't know what caused it to not be detected in the first place but still...
Not sure if it's an issue with the device(Phone for you, blu ray drive for me) or if it's a problem with the PC even though other things might still work for you as it definitely did for me(phone, headset, mouse, keyboard, usb extender + all the external hard-drives connected to it)...
Problem exists in all computers, Mac, pc, linux
Did you try what I suggest in Post #6 above?
This worked for me when I had the same issue. adb and fastboot would work, but it would not mount MTP.
And just in the last day or 2 I helped someone else with the same issue and fix.
The phone doesn't show up in device manager.
Have you modify the Kernel? (Applying some settings for example)
I browsed over the web for this issue and found some people with the same problems. They solved by removing the settings applied on the kernel or flashing a new one.
I've flashed various kernels and ruu, still same result
Still looking for help