Results with this problem:
Start up Minecraft -> BSOD
Start up Minecraft -> Black Screen with a flashing picture in the corner
Start up Minecraft -> Start Playing -> BSOD
Start up Minecraft -> Start Playing -> Frozen
Start up Minecraft -> Start Playing -> Looks very strange -> Move or Open menu and select something -> Frozen

And when i'm saying "Frozen", I mean the whole PC. No "not responding", No "get out of it with Ctrl+Alt+Del", just frozen. I can't do anything execpt unplug the PC or hold down the power button.