Question about Dell POWER SUPPLY Power Supply

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Dell Dimension 4100 won't stay switched off

I'm not ready to part with my trusty Dimension. It multitasks quite happily under Win2000. It has however developed an annoying quirk. When I switch it off (either full shutdown or hibernate) it will now switch itself back on after a delay ranging from 1 second to 30 minutes. My workaround is to unplug it from the wall as soon as it clicks off after a power-down. I suspect this is probably a power supply problem. Any thoughts?

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  • solutionx Mar 07, 2009

    As I suspected - this is unusual!
    It happens whether it is shut down or hibernated. Hibernate should not be compared to sleep or standby because in hibernation the machine is switched off. It can be unplugged with no loss of data or work in progress. So, the machine shuts down - powers off - whether in 'full' shutdown or hibernation mode. You hear it go click and at that point you must pull the plug, otherwise in a matter of seconds or minutes, you will hear click, whirr, fans and the machine is back on.


  • solutionx Mar 07, 2009

    Thanks for the details. As soon as my virus scan is complete I will do that and report back.

  • solutionx Mar 10, 2009

    Techigs: I did check the BIOS settings and it was set to wake up on LAN events. Not sure how it could have got set that way, but it seems to be able to stay switched off again! So thanks very much for your idea.

  • Randall  Trahan
    Randall Trahan May 11, 2010

    Good answer techigs...you deserve the 4 diamonds on that one..

  • Randall  Trahan
    Randall Trahan May 11, 2010

    Gotta be honest with you. Heard of lot of complaints about computers shutting off early but never any coming back on..it has to be rebooting to come back on..in which case it could be a couple of things. Did you notice if it restarts and then comes back on or you are saying it goes into hibernate/sleep mode then comes out of it...let me know and we'll take it from there.

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Well try this to check some settings.
1. Reboot computer and hit F2 to go to the BIOS settings.(you may have to keep pressing F2 until you see that it is going into setup)
2. Once in the BIOS you will have to use the arrow keys to move around and there is a key at the bottom. Move to the Power section and hit enter.
3. Check and make sure that the settings for Power up on PCI/PCIE Devices is off.
4. Check and make sure that Auto Power On is Disabled.
5. AC Recovery is off.
6. If all the settings are done, hit ESC to exit the menu.
7. Arrow key over to Exit.
8. Hit enter and comfirm save settings.
If all the settings are correct, then you are quite possibly correct in it being the power supply.

Hope this helps.

Posted on Mar 07, 2009

  • Tim Crosslin Mar 10, 2009

    Glad to of been of service.

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