Windows 7 - Random shutdown problem - Corsair Builder Series CX430W ?

Hi all!

My system started having random shutdowns recently. I suspect it's the PSU but I really don't know how to evaluate it.

The symptoms: Under heavy load (playing Dragon Age for about an hour or a bit more) the PC just shuts down. No BSOD, no error message, nothing, it just shuts down. I can't turn it back on right after that, only after waiting a couple of minutes and/or switching the PSU on and off (I'm not really sure which of these solves the problem). Such problem never occured under normal load so far.

I know that CX430 has multiple different voltage protections built in, I'm just not sure which one gets triggered - to be honest I'm not even sure if it's the PSU, but the fact that I can't turn it back on immediately afterwards suggests some sort of circuit breaking mechanism behind it.

Any suggestions? How could I confirm that it's the PSU? What else can be the cause?

The system specs are these (the PC was built in last June):

OS
Windows 7 Home Premium 64 bit
CPU
Intel Core i3-2100 3.10 Ghz 1155 Box
Motherboard
Gigabyte GA-PA65-UD3-B3
Memory
******** 4096MB ******** XMP BLU DDR3 1600MHZ
Graphics Card(s)
SAPPHIRE 11192-01-20G HD6670 1GB GDDR PCIE
Sound Card
- (integrated)
Monitor(s) Displays
LG Flatron W1934S
Screen Resolution
1440x900
Hard Drives
Samsung 500GB F3 7200RPM 16MB SATA2 HD502HJ
PSU
Corsair Builder Series CX430W
Case
Coolermaster RC-430-KWN1-GP Elite

PS: I'm not sure if this problem belongs here as there is no BSOD, admins, please move it if necessary

Could be power, overheating, or a hardware fault. You can test the PSU using Britton30's PSU Testing



Download and install the appropriate version of HWINFO: HWiNFO32 for 32-bit Windows 7 or HWiNFO64 for 64-bit Windows 7 to check hardware temperatures by running in sensor-only mode. Start logging the temperature through sensor-only mode when the computer first starts, and let it run until the computer shuts off during stress.

Save the CSV file in a place you will remember, and then compress the CSV file to a zip file and upload to here for us to analyze by following the steps in Screenshots and Files - Upload and Post in Seven Forums.



You can also run the following stress tests to check for hardware errors causing the system to fault:

• Use FurMark: VGA Stress Test, Graphics Card and GPU Stability Test, Burn-in Test, OpenGL Benchmark and GPU Temperature | oZone3D.Net to test the graphics card GPU. Then use the |MG| Video Memory Stress Test 1.7.116 Download to test your graphics card memory.
  
  
• Run Hardware - Stress Test With Prime95 to determine any hardware problems. Run all three tests for a few hours each. If you get errors, stop the test and post back here.