PC freezes while benchmark/gaming only, getting desperate!

[thez]

Hi everyone,

I have this strange problem since i assembled my new PC.

It works perfect until i start a game (tried GTA IV and BF3), after a couple of minutes of playing the PC just completely locks up, mouse or keyboard does not react and de HDD led on the computer just burns constantly.
the sound turns into a sort of soft distorting noise, and sometimes after a while the monitor says: no signal.

the only way to get the PC working again is by holding the power button.

I have tried the following:

replaced power supply; (i had a 600w cheap PS and replaced it with the 700w huntkey)

tried a fresh windows 7 install on a normal HDD

tried a fresh install on the SSD

tried a different graphics card (8800gts)

Ran a CPU stress test with Prime95 for about an hour with temperatures stable at 60 degrees celcius. no freezes.

Installed all new drivers for everything.

Ran a GPU benchmark, PC freezes after a while with both graphic cards.

tried using one stick of RAM at a time

voltages and temperatures from the bios:

voltages:
CPU core: 1,208V
CPU i/o: 1,040v
System agent voltage: 0,920v
DRAM voltage: 1,488v
3.3v: 3,360V
5V: 5,045V
12V: 12.144V

temps:

CPU temp: 51 celcius
System temperature: 30 celcius




I have no idea what to try next, so i'm desperatly seeking your help
Thanx in advance!


specs:

MSI P67a-c43 B3
Intel i5 2500k
MSI GTX 560 twin frozr II OC 1GB
G.Skill ripjawz DDR3 1333mhz 2 x 4 GB
Huntkey 700w - http://www.huntkeydiy.com/ProductsPartic...adc27e001d

OCZ agility 3 120GB

[ISO]

This is maybe the hardware , anyway try to clean up the software part by deleting all the useless tools on your pc and use Ccleaner.

[Zombot]

Try and clean your computer regularly with programs such as CCleaner or Advanced Systemcare and get a more powerful fan.

[Sql]

Read this -> http://www.supportforums.net/showthread.php?tid=12900

[Pondake]

Tried searching for any corrupt capacitor on your GFX cards?

If you don't know what it is:

Spoiler (Click to View)

You can see that 3 of them are broke.

Those things broken will cause the problems you defined in the OP.

[prince of persia]

Try running without a graphic card. Take out your graphic card and see if it still freezes.