can they boot in safe mode by hitting F8 while booting ?
It won't even get to the bios screen. So F8 does nothingSounds like the hard drive or something has failed causing a BSOD on reboot.
How To Disable Automatic Restart on System Failure From the Advanced Boot Options Menu in Windows 7
Then you have hardware that has failed. Depending on how competent this person is make sure EVERY device is unplugged from the computer.. mouse, keyboard, usb drivers, usb keys and leave monitor plugged in and see what happens.It won't even get to the bios screen. So F8 does nothing