Stuck on boot splash screen after factory reset - One (M8) Q&A, Help & Troubleshooting

My sister was having problems with her phone today which made the phone unusable.
Constant error messages about various processes stopping unexpectedly and random reboots. She had tried various things, including rebooting numerous times. Until it was recommended by a friend that this could be remedied by performing a factory reset from within the boot loader.
So, my sister has tried this. Unfortunately the phone has been stuck on the boot splash screen (with the HTC and One logos) for over an hour now.
Is there something we can do to get out? Would going back to the boot loader be possible and/or help?
EDIT: having tried a reboot, using power + volume up, it is now stuck in a bootloop.
In case it is useful, is is using stock HTC ROM and stock HTC boot loader.

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Now the phone just won't boot up, it gets stuck on the htc logo screen.
I have read some suggestions here, but nothing works.
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Any help will be very appreciated.

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It's possible that is caused by corrupt data, in which case a factory reset from stock recovery should do the trick. Unfortunately, it's also possible that it's a hardware issue...

[Q] Update ran and stuck in att logo

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Another Bootloop issue

I'm having problems getting my phone past the bootup screen. It first loads the logo then goes to the animated logo then the rethink possible animation and then finally gets stuck on the glowing samsung logo. It then shuts off and redoes the loop a couple of times until it stops with the battery charge up screen and freezes there until I remove the battery.
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I'll post this question in new thread.

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Flash back to stock. Stock firmware fixes all sorts of issues.

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