My brand New PC reboots while playing games like Battlefield 3 or DOTA 2

GetOverHere

Honorable
Mar 21, 2013
5
0
10,510
Good afternoon! My brand new PC (it is 2 weeks) keeps rebooting while I play games. There are no lags or something like this. It just reboots and after 10 sec. I can use it again.
I can't understand what causes it.
Here are my specs:

Core i5 3570K (3.40GHz)
ASRock P67 Extreme 4
240GB SSD + 2000GB HDD
DVD-ROM
16GB DDR3-1600
Coolermaster 690 II Advanced Midi Tower
750W PSU
2GB GeForce GTX 660

Problem is definately not cooling - I played it with SppedFAn and everything stays at 30°.
Please, I really need help!
 
use hwmonitor and speed fan together. you can never be absolutely sure speedfan is correct. i found this out when i overclocked my 920. suddenly it was 10'c cooler even though it was running 1ghz faster than stock. i load up hwmonitor and see my temps were 10'c higher than in speed fan.
so i recommend you use something else. hw monitor/ real temp/core temp are 3 good 1s.
use gpu-z to monitor your gpu temps and vddc(vrm/voltage regulator modules) voltages/temps.

also go into bios and load optimized defaults. disable any auto overclocking software you may be running.
after which you should run prime 95 blend test for 6-8 iterations. if it doesnt conk out with that stress test you can assume your pc is somewhere near stable...
lastly check the ctrl pannel/admin tools/events/ events viewer application/system for red X or yellow triangles... especially check for critical errors which should show in the first tab you open when you select the event viewer.