PC Restarts sometimes after x-xx minutes of playing

[BuzzFuzz]

PC Restarts afrer xx minutes of gaming

Hi,
problem is, after playing my computer crash, just black screen and lag sound, like loop zzzzz.
After this i need to turn off pc manualy with power button. Reset-reboot button don't do nothing.

There is no Minidump folder, which is set for as must be (automatically restart is unchecked, small memory dump (256 kB) selected...)

What can be wrong?

 

[gregrocker]

While you wait for analysis, start working through the Troubleshooting Steps for Windows 7 which often themselves will uncover the problem.