Power Supply Problems..I think

Discussion in 'Build Your Own PC' started by kmp6258, Nov 25, 2005.

  1. kmp6258

    kmp6258

    Joined:
    Nov 25, 2005
    Messages:
    5
    I'm confused. I'm trying to build a pc for my wife. I bought a used
    ASrock K7S41GX motherboard. It turns the power supply on at
    ATX connection, and will not post using an AMD Athlon 2000+

    I've read about about the soft power on, wake on lan stuff. This motherboard
    has a jumper to ignore +5 USB or PS2 Wake. But it doesn't change anything.
    I've reset CMOS, but still nothing. Even tried a different power supply, and
    it comes on at ATX connection.

    What's suspect is..I used both of these power supplies trying to fix another
    mobo that fried the processor. Is it likely that both power supplies are bad?

    One is an older 300W..the Second is a brand new 350 with Sata power connectors. BTW, the drives spin up fine, so do all the fans.

    The only other thing I can figure is, it's just a bad board. Maybe a bad sodder
    short..any ideas?

    Oh, one more thing..I used the same board to try and post a AMD Duron 950,
    same problem...
     
    Last edited: Nov 25, 2005
  2. FLG

    FLG

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  3. kmp6258

    kmp6258

    Joined:
    Nov 25, 2005
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    Thanks..but been there

    I tried this, still nothing. Actually before I deal with the no post issue,
    I'd like to understand why the moterboard turns on the power supply
    at connection...
     
  4. Cricket

    Cricket Shiro Usagi

    Joined:
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    Kaneohe, Hawaii
    What do you mean the motherboard turns on at connection? Do you mean the system tries to boot when you connect the motherboard power connection from the power supply? Or when you plug the power supply in to the wall outlet?

    Are you certain that used motherboard is good?

    :) Cricket
     
  5. delta013

    delta013

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    Check the BIOS settings. Some motherboards have an option to automatically turn the PC back on after a power failure. This is used for servers and anything else where someone might not be around to press the button. Perhaps the previous owner enabled this feature. I think it's usually under the boot options.

    Also, like Cricket said, we need to know if you're talking about when you connect the ATX power connector to the motherboard or when you plug the power supply into the wall. You proabbly shouldn't plug the ATX connector in with the power supply plugged in and turned on.

    Delta013
     
    Last edited: Nov 26, 2005
  6. kmp6258

    kmp6258

    Joined:
    Nov 25, 2005
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    Either way it happens

    I first noticed the problem when I plugged it into the wall. The power supply
    comes on without touching the power switch. There are no bent pins,
    no visible shorts on the board. And after trying it with a third power
    supply, it still comes on without power switch jumpers even being connected to
    the board. (nothing connected except power supply & video)

    And since it will not post, I can't change the bios settings. I've reset the
    cmos til I'm blue in the face. Changed pin settings on the +5 usb or ps/2
    wake..even left the jumper off.

    I think it's a bad board that got by the manufacturer, and I got stuck with it.

    :mad:
     
  7. Cricket

    Cricket Shiro Usagi

    Joined:
    Sep 14, 1999
    Messages:
    34,001
    Location:
    Kaneohe, Hawaii
    If 3 different power supplies are doing the same thing then the motherboard is probably faulty.

    :) Cricket
     

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