Computer turns off while playing games

noise

Distinguished
Apr 27, 2012
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No errors? Blue screen? Just complete power loss?

If so I'd point the finger at a thermal trip on your CPU (check your heatsink is correctly attached, thermal paste applied, and fan running). Other than that probably a motherboard or PSU failing.
 
Without more information it's hard to say what the cause is. Perhaps your CPU or GPU is overheating (perhaps both). A program like HWMonitor can help you determine that.

http://www.cpuid.com/softwares/hwmonitor.html

Perhaps your power supply is being over burdened or getting old and you need to replace it with a good quality PSU that can provide the necessary amount of power.

Perhaps your Windows OS has become corrupted and you need to re-install it. Or maybe you just need to update the graphic card drivers.