Re: PSU?

Discussion in 'Computer Information' started by Tecknomage, Jun 29, 2009.

  1. Tecknomage

    Tecknomage Guest

    On Sat, 27 Jun 2009 11:06:35 +0100, "Dejacq" <>
    wrote:

    > My desktop power light is on but nothing else. It won't boot up, won't turn
    > off etc.
    > It will be the PSU right?



    Depends.

    Do you get at least one beep on power up?
    If you do, this mean your BIOS Initialized, you just have no video.

    Do you get MORE than one beep? Do the beeps sound like Morris Code?
    This indicates a major hardware failure in POST...
    http://en.wikipedia.org/wiki/Power-on_self-test

    Now if you do NOT get any of the above, as another reply indicates,
    you will get this symptom if your motherboard is blown.


    As to your PSU, which COULD be the problem:

    Open your system (with power off of course) so you can see the
    motherboard. Turn ON. Some motherboards have LEDs that light for
    each DC voltage (+5, -5, +12, -12, and some have a +5 Standby), see if
    yours does. By the way, the +5 Standby is the LED that stays on even
    when your system is shutdown (as long as AC is on to your PSU), it's
    like the standby on your remote TV or Surround Sound System.

    As other replys say, you can use a multimeter to check your PSU
    voltages, very carefully, at the Main Power Plug and the separate CPU
    Power Plug (4-pin, brown/yellow wires). Below page has a very good
    pin-out diagrams:
    http://en.wikipedia.org/wiki/Computer_power_supply






    --
    ======== Tecknomage ========
    Computer Systems Specialist
    IT Technician
    San Diego, CA
    Tecknomage, Jun 29, 2009
    #1
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