Why does my system keep shutting down when i logg off any game?

[rb46]

Hello,

here is my computer,
case: Thermaltake Level 10 Series Level 10 GTS Black SECC ATX Mid Tower Computer Case
Mobo: ASUS P8Z77-V LE
CPU: Ivy Bridge i5 3750k
Ram: 8GB
PSU: turbolink switching power supply 500w
GPU: XFX HD 6770

Every time I logg off any games either Steam or WOW my computer shutsoff and reboots. Sometimes I get a screen that says I had a system surge. This happens alot and I checked all connections to computer

 

[Mr_____]

Sounds like a PSU problem, and considering I've never even heard of that brand I'm not surprised.

 

[rb46]

Best answer selected by rb46.