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PC powers off apparently randomly

Discussion in 'Hardware' started by booey1, Feb 2, 2015.

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  1. booey1

    booey1 Thread Starter

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    Hi

    I'm fixing an old PC and it keeps powering off after 5-20 seconds for an unknown reason.

    Athlon x2 4600+
    MSI msn 2 sli deluxe
    2 GB ram
    Geforce 8600 gt

    What should is check? Post is fine, no obvious issues in the bios.
     
  2. booey1

    booey1 Thread Starter

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    Okay, so I haven't installed the operating system yet and if I just leave the PC after the post it stays on, but in the bios or windows install it turns off after a random time.
     
  3. KomputerKid

    KomputerKid

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  4. booey1

    booey1 Thread Starter

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    I don't think I can post that info.

    I've tried a second PSU. First PSU is colors it 550w second is cwt 305w.

    Does the 8600gt really draw that much? It doesn't have an extra power cable...
     
  5. booey1

    booey1 Thread Starter

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    I've tried disconnecting everything but the GPU and that doesn't help either. You might be right about the GPU. I'll swap it.
     
  6. KomputerKid

    KomputerKid

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    The minimum is 350 Watts. I would have though it would be more.
     
  7. booey1

    booey1 Thread Starter

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    I thought I had fried it, but thank God, it seems okay.

    I put in the other GPU (7900gtx) which does require the extra power cable. I then managed the full format of the drive from the windows CD and all the copying of data. Now it just shuts down again after post when it gets to the boot stage.
     
  8. booey1

    booey1 Thread Starter

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    Still stuck :(
     
  9. replay

    replay

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    Take off the heatsink fan......clean off thermal compound.......reapply new compound......reattach heatsink.....see if it has same problem
     
  10. booey1

    booey1 Thread Starter

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    Thanks, so I've tried that. It doesn't seem to have made much difference, but the PC has stayed on for longer (15 minutes+) so I have now installed WIN XP and can boot. Still random power downs though :(
     
  11. booey1

    booey1 Thread Starter

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    Another update. I've managed to fully install XP now, but it still restarts at certain points. I think before it was constantly restarting when it accessed the HDD on trying to load windows. Just now it restarted on starting to load a game - not sure what it was accessing.

    Any ideas?
     
  12. plodr

    plodr

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  13. booey1

    booey1 Thread Starter

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    Thanks, I'll try that. I don't think it is a bsod, but just a shut down.

    Update: on trying to access the DVD ROM drive makes the system shut down. I've repeated this 3 times and its happened every time.

    Could it be something to do with the IDE cable or connection as that would explain why the HDD was causing it to shut down before.
     
  14. replay

    replay

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    Disconnect the data and power cable at the back of the cd /DVD drive then reboot......see what happens
     
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