Question about Compaq Presario 5000 PC Desktop

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Finding a short in PC components.

This computer wouldn't turn on. I thought it may be the power supply, so I used another one and yes, it was the power supply. However, when I tried the new PSU, I had all other peripherals disconnected except for the motherboard and video card. After the mother board loaded up fine, I thought that the problem was solved. So, I went ahead and put everything back together, but when I went to turn the thing on, it did just like before!

I checked voltage at all the connectors and both PSUs are definitely broken now. So, I've concluded that there must be a short in one of the components that I had disconnected. They are:
Modem, ethernet card, floppy drive. 2 HDD, and a DVD-RW.

I'm guessing that its one of the drives that require power, but I guess it could be one of the PCI cards too. I thought I could check the power connectors of the drives to see if they were shorted, but I don't know what Ohm reading to expect. So, I won't know if the reading is normal or not. I don't want to keep burning up PSUs just to find the short.

Does anyone know the normal resistance readings for floppy, hard disk, & optical drives on the power terminals?

Posted by Anonymous on

  • 2 more comments 
  • Anonymous Nov 18, 2007

    I'm sorry, check what out? Do you have a link or something?

  • Anonymous Nov 18, 2007

    OK, for a second I thought you were talking about your avatar. :)

  • Anonymous Nov 18, 2007

    Thanks for the chart, though it is too small for me to read. I think I found that same chart somewhere on the web, but it didn't have any specific meter readings, as far as I remember. Do you have a website or link I can find the info at?

  • Anonymous Nov 18, 2007

    Oh yeah, I think it may be the DVD-RW drive. I got a reading of 0 Ohms between pin 1 and 2. That may be the short. I've got to check some other things, and I want to be sure I've eliminated the short before installing a new PSU. The last one I just happened to have laying around. The next one's gonna cost me.



1 Answer

Tony Clayton

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Check this out.

Finding a short in PC components. - power.gif

Posted on Nov 18, 2007

  • 1 more comment 
  • Tony Clayton
    Tony Clayton Nov 18, 2007

    The chart I have can't be uploaded to the page.

    I am going to try soething different to see if it will let me up load.

  • Tony Clayton
    Tony Clayton Nov 18, 2007

    Here is a chart that will help you

  • Tony Clayton
    Tony Clayton Nov 18, 2007

    just plug in one at a time you might have a wire pinch some where so check your wireing.



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