My pc crashes while playing certain games. I can go on playing Bioshock 2, fifa 2010 for hours on end without anything going wrong. But I am not able to play Burnout Paradise or Mirror's edge without having the computer crash on me after every few minutes.
Description of the crash -
It never goes to a BSOD, just shuts off. Doesn't restart on its own, requires me to restart it. I turned off the automatic restart option in the system menu hoping to take a look at the BSOD but to no avail. There was also one day when this was happening while playing Bioshock as well, but when I tried playing the game the next day, all was well, and i played for several hours at a stretch and finished the game.
My specs -
intel pentium D 3.4 Ghz
intel g41 motherboard
Kingston 3.25gb Ram (32bit system)
Western Digital 150Gb
ati 4670 hd, 1 gb
LG DVD drive
So, if I understand correctly your monitor shuts itself off in the middle of gameplay? I have a similar issue and I've since underclocked my GPU and downgraded my graphics in the games that cause this issue.
Could be that your GPU is overheating. Hwmonitor will show your GPU temps. Maybe have a look at those during your gaming sessions to see how high it goes.
MY GTS250 does the same thing. My monitor just turns off. PC is still on but I have to hit the restart button. Can't alt-tab or ctrl-alt-del.