I was using my computer - had a few programmes open but no more than usual - SAM Broadcaster (but wasn't streaming), Photoshop, VLC, chrome when all of a sudden my graphics card crashed about three times in a row. Then I got an error message and Windows 8 said it needed to reboot.
It did that and now I cant use my computer at ALL, it will get to the log in screen and when I put my password in it just loads and loads and then the computer restarts again with no warning. I cannot get into safe mode or anything like that, cannot even click on the shut down button at the log in. screen. The Computer temperature is ok - its not overheating or anything.
Hmm...this is trial and error time. I would say "virus" but there is no way to tell now if you can't boot. I say check all cables, open the disk tray, pop in the Windows 8 CD and happy, happy joy time.