Power failure issue

Discussion in 'Computer Support' started by +WoZ+, Jul 11, 2003.

  1. +WoZ+

    +WoZ+ Guest

    Hi all, bit of a mysterious one for you to ponder. A system I built for a
    mate has been running fine for 7 months but recently blew a PSU. This was
    replaced with a new generic 400w and ran fine but every now and again the
    power just dies. No windows shutdown or restart, just instant power failure.
    After switching off at the wall then back on it powers up fine. It is
    completely random in how long it takes to happen and can be due to burning
    cd's or playing games, but usually within 30 mins to 2 hours. I had the
    system here and ran sisoft sandra burn-in for over 24 hours with no problems
    and also ran 3DMark 03 at the same time as sandra to really push it. The new
    PSU was returned and replaced with another and it still shuts down. I
    suspected his surge protector was the culprit so he bought a new one to no
    avail. I now suspect the motherboard but i'm reluctant to send it back as i
    ran it for so long without a hitch and can almost guarantee the same will
    happen when Ebuyer test it. I've checked the voltages in the bios and all
    are pretty close to their specs. Any ideas?
    Woz

    main system specs;
    ECS K7S5A
    Athlon XP2000 w/AMD HS/F
    400w generic PSU
    512mb pc2100
    80Gb Maxtor
    13gb seagate
    Gainward GF4 ti 4800se
    Liteon 24x cdrw
    LG dvd
    Win XP Pro
     
    +WoZ+, Jul 11, 2003
    #1
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  2. Try disconnecting the power switch wire from the motherboard and see if it
    still shuts down. The switch may be shorting out.
    If it still shuts down try a third power supply from a different
    manufacturer. If that don't cure it then it's that fine motherboard.
    Make sure nothing else is wrong like fans or overheating.
     
    BananaPannaPoe, Jul 11, 2003
    #2
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  3. +WoZ+

    Me2U Guest

    Could also be a power management conflict. Both BIOS and windows have power management schemes and often interfere with each other. Use one or the
    other, but not both. See if the drop time is
    constant after bootup within minutes. If so then possible one power management is turning off the computer due to not detecting the ongoing
    activity. You can set both to not turn the computer off at all and see if that helps. To enter BIOS setup look at screen on bootup for what key to
    press, often DEL. For windows go to control panel and the power icon.
     
    Me2U, Jul 11, 2003
    #3
  4. +WoZ+

    +WoZ+ Guest

    power management schemes and often interfere with each other. Use one or
    the
    management is turning off the computer due to not detecting the ongoing
    that helps. To enter BIOS setup look at screen on bootup for what key to
    The problem DOES appear to be a faulty power switch after all, my mate says
    it is running ok so far with the switch disconnected. Having never had a
    switch failure before, I didn't even suspect it! I'll have to remember to
    check even the most basic things next time. We have a local saying which is
    relevant to this problem, 'E's going all 'round Bristol to get to Bath!'
    Thanks to all of you for your replies.
    Woz
     
    +WoZ+, Jul 12, 2003
    #4
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