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PC turns off after several seconds

Hey,

My pc started to turn off after about 2 minutes. Then after 10 seconds, followed by 2 seconds. I figured it was the power supply so I bought a new one. My old one was 600 watts so I bought another 600 watt power supply. It turned out I even bought the same brand, OCZ Technology.
With the new power supply my pc won't even turn on. A couple lights light up on the mother board just like with the old power supply, but my machine won't power on. So I plugged my old power supply back in and it did the same thing as before. My pc would stay on for a couple minutes and shut down and then go down to staying on for a few seconds.
So what's wrong? Are not all power supplies for all pcs? Can it be that the new one isn't compatible? I understand there's always a chance that it was just broken out of the box.

- Intel Core 2 Quad Q6600 2.4 ghz OEM
- 4 Gigs of ddr2 ram, 4 sticks of 1 gig each
- XFX nForce 680i LT SLI motherboard
- PCI Express x16 graphics card
- one sata harddrive, 450 gigs
- one 500 gig harddrive (not sure what kind it is. it was external but the casing's power broke so I stuck it in like 3 months ago)
- one dvd dl drive (plan to get another)
- 2 12mm fans, and 2 8mm fans in case
6 answers Last reply Best Answer
More about turns seconds
  1. Check the CPU HSF; is it [still] properly mounted, or has it come loose? Shutoffs in a decreasing period of time are often due to overheating.
  2. I did run it with the case open and watched all the fans working (until it all shut down). I wouldn't be surprised if It's the heat sink fan because I remember it was kinda cheap. Like $25 and has always been very loud.
    In case I need a new heat sink fan, does anyone have any recommendations that I could go out and get, say at Micro Center?
  3. I bought a new power supply and it all worked out. Turns out the old one was done and the first new one was defective.

    Thanks
  4. Best answer
    All's well that ends well. Perhaps it was the PSU that was overheating.
  5. Best answer selected by verbality.
  6. Thanks. Hopefully your PC will run well. Continue to monitor your temps just in case.
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