My PC turn off after i start up a game and play it for around 5-6 minutes one it turns off the screen goes black and the light on the power button of the monitor goes orange but the sound is still on but then after a short time the sound begins to repeat. this happens to me with every game that needs graphics. My video card is nvidia geforce 9400 gt. my system rating is 4.9 and my proccesor is a pentium(R) dual-core CPU E5200 @ 2.50 GHz and my RAM is 2.00 GB my system type is a 32 bit operating system.