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Computer freezes, CPU fails, solution?

I recently have this problem. My computer HP dc7700 SFF freezes randomly.
I keep this computer on all the time for running a teamspeak server (very light use). The computer freezes randomly, usualy when I'm not using it for a while (I use another computer for general use) The computer will just freeze, the screen stops, can't move the mouse, numlock on keyboard has no response. There's no event log on computer management. I have no idea what's going on.

I open the case and find that the cpu heatsink is cold. The fan of the CPU and PSU are working and don't seem to be overheat, I can eject the DVD-drive's tray. The screen stop, if it freezes for a long time, it will just have black screen. I can force shut down and start and work again.

So does can anyone know what's the problem? CPU failing? anything I can do to fix it? any help is appreciated :)

The computer's spec: Core2Duo 1.86Ghz 128mb ATI x600 3GB DDR2 Ram 2X 2TB drives, DVD-burner

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Have you run memory diagnostics? – jdh Jun 13 '12 at 16:25
The fact the heatsink is cold tells me the CPU is being turned off. – Ramhound Jun 13 '12 at 17:11
Will do Ram test tonight. Yeah if the CPU is fired, I won't be able to turn the pc back on right? – lochy Jun 13 '12 at 17:46

Sounds like bad memory. If you have two sticks in there already, use trial and error to figure out which one, if any, is bad. As an alternative, run memtest86+.

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will do it now. – lochy Jun 13 '12 at 17:47
tested for 2 hours with no error. any more suggestion? – lochy Jun 13 '12 at 19:51
Update your graphics/audio/network drivers? – Bigbio2002 Jun 13 '12 at 20:28
I tested the ram for more than 11 hours with no error. Some update: i tried the HWInfo ( ) and the log showed that the CPU voltage and temperature were fine. The computer just stopped and crashed. Screen are stopped, cant move the mouse and thing like that. The CPU was cold, all the fans are moving. I can still use the computer after i restart it. The crashes are pretty random sometimes after one day, sometimes after 2 or more days. anyone have any idea? I can upload the log if needed. – lochy Jun 19 '12 at 20:51
It could be a bad PSU or bad motherboard too. Before that, verify that it's not the processor by running Prime95, IntenBurnTest/Linpack, or another similar stress-testing program. Be warned, make sure you monitor your CPU temps closely when using these tools. – Bigbio2002 Jun 20 '12 at 18:57

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