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Question about Compaq (480082-001) ( 480082-001 ) Power Supply

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Presario S4020wm desktop

Recently the computer will suddenly and randomly shut down, then restart and continue to act this way, cycling on and off. After removing plug from wall and waiting we can restart the computer but soon the same problem will occur. Suspected heat and cleaned all dirt and dust out. Checked cpu fan and PS fan. Played additinal fan on PS and ran all day. Closed up computer and after several hours the problem started again. Suspect PS but not sure. Does anyone have similar problem?

Posted by jim73 on

  • 2 more comments 
  • jim73 Sep 06, 2007

    The problem doesn't appear to be the fan, but it is a possibility. Sounds like a worthwhile approach.

    Looking into line voltage and load on the power supply.

    Is an exact replacement fan available?

  • jim73 Sep 06, 2007

    Fan sounds like a possibility, but seems ok.

    Looking into line voltage and load. Line voltage may be a problem with air conditiners running in house.

    Load appears normal. Standard mother board, 1 CD drive, 1 hard drive, one floppy, normal video card and 1 modem card.

    Is that specific fan available anywhere?

  • jim73 Sep 07, 2007

    Pursuing the house line power for any problems.

    Apparently the "power-good" signal would cause the exact symptom that we are experiencing.

    It operates as follows:

    If the power supply can't maintain proper outputs, (like a brown out), the "power_good" signal is withdrawn and the processor automatically resets.

    When the power output returns to its proper levels, the PS regenerates the "power_good" signal and the system again begins operation ( as if you had just powered on).

    This is precisely the kind of behavior that the computer is showing, so it is telling us something.

  • jim73 Sep 08, 2007

    I agree. The thermal overload would give the same or similar symptoms. When we operate the computer with the case open or with a small fan on the PS, the problem diminishes. Unfortunatly we did this at another location, so we have to discriminate between the thermal, (supply does not seem to be especially warm), and the power source at the original location. Always happens when you do two things at the same time.
    Will try to determine which before investing in a new power supply.


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You need a new power switch. I am currently working on a S4020WM with the same problem. I cut one wire to the power switch, then used a paper clip to make a jumper to start the machine. It has run fine since then. The only trouble I am having is finding a replacement switch.

Posted on Dec 28, 2007


Same problem here.. power switch shorting. Either replace it, rig one up, or unplug it from the mother board after startup!

Posted on Aug 15, 2008


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Yes, the power supply fan is either slowing down and allowing supply circuit to heat to a point where a thermal detector detects a shutdown condition, or the supply fan may be turning off. I had similar problem and solution was a new power supply fan.

Posted on Sep 05, 2007

  • 3 more comments 
  • Anonymous Sep 06, 2007

    so the new power supply fan was not the solution? did you get an exact match fan?

  • Anonymous Sep 07, 2007

    yes, inspect your house voltage for issues first. make sure no power dropouts. also try swapping breaker in house panel with another breaker.

  • Anonymous Sep 08, 2007

    thermal overload exhibits the same symptoms, though. try to monitor the power ok signal for dropouts (using a record-able voltmeter). if you can't, one solution is to try another power supply.

  • Anonymous Sep 13, 2007

    so all this help is rated as NOT HELPFUL?

  • Anonymous Oct 06, 2007

    so all this help is rated as NOT HELPFUL?


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