Computer restarts when playing certain games.

Hello guys. I'm kinda needing help with my issue. when i play certain games anywhere between 10 and 30 minutes my computer will just restart... no bosd (i took off the auto restart) and still restarts like if it lost power. I have replaced video card, ram, cpu fan, case, I have also tried reinstalling windows 7 and still same issue. All the help is appreciated.

Many gaming user face same kind of problem and the main reason for this incompatibly of game with system or corrupt source of games. So check system compatibility of games with your Computer configuration.