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computer will not power-on unless I unplug power cable first

Discussion in 'Hardware' started by fnukyguy, Nov 20, 2008.

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  1. fnukyguy

    fnukyguy Thread Starter

    Joined:
    Nov 20, 2008
    Messages:
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    After shutting down, my computer will not power-on again unless I unplug the power-cord, then plug it back in (or use the psu on/off switch).

    I have tried changing PSU, same thing happens.

    My guess it has to be related to my motherboard.
    I have the latest bios. I have reset the bios.
    This happened after upgrading to a opteron 180 cpu. But I'm not sure if its related.
    I have tried disconnecting the RAM, harddrive, graphics card to no avail. Also tried refitting the power-button cables.


    Computer is rock stable once its on ...It powers on fine if I switch off the PSU with the button that is located on the psu, or pull out the power-cable before turning it on.

    Any ideas what might be causing this?


    Epox 9npa+ultra motherboard, amd opteron 180 (939), win xp sp3, 2gb ram
     
  2. win2kpro

    win2kpro

    Joined:
    Jul 19, 2005
    Messages:
    11,670
    Unplugging the power supply, or disconnecting from the source allows everything to reset in the power supply and on the motherboard. This situation is most always associated with a defective power supply.

    Since you have changed the power supply and the condition persists then the problem almost has to be a fault in the motherboard POWER GOOD circuitry.

    If it were my machine I would just get in the habit of turning off the power supply after use, and live with it. Unless the problem is something obvious such as a "bulging" or leaking capacitor, chasing a problem like this is like chasing ghosts.
     
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