Possible power supply problem


About a week ago I started having some problems. I decided to first unplug all the additional items (usb printer, etc.) and just left the monitor, keyboard and mouse connected. But then when I went to plug the unit back into the electrical outlet the little green lite on the back of the tower did not lite and I had not power to the pc. I went to the HP website and followed the trouble shooting steps ---

which is why I am now thinking that it my be the power supply unit. I was doing some research and instead of just getting a new psu some sites state to test the power supply unit first. Some of the sites suggest testing the power supply unit manually with a multimeter or with a power supply tester.

I do not have a power supply tester so I would have to go out and get one of those first. I do have access to a Simpson 260 VOM. The Simpson 260 VOM (volt-ohm-milliammeters) looks different from the multimeters I have seen online from this one. Primarily because this Simpson unit is much much larger; in a hard black case and is not digital.

Can I use this Simpson VOM to test the power supply? If so is there anything specific I need to know or does anyone know where I can get information on exactly how to do this (don't want to make things any worse than they already are but the closest place to take it in for service is about 40 miles away and I can't easily take the tower in since I am disabled).

Any assistance would be so very much appreciated.


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  1. What model HP computer do you have?

    is it a full or slim case?
  2. Best answer
  3. Emerald said:
    What model HP computer do you have?

    is it a full or slim case?

    It is a Pavilion 7865 - not sure what you mean by a full or slim case
  4. JackNaylorPE said:

    I will look at the information for the paperclip trick - I did just look over it briefly but I do not have a power switch on my psu - I just plug the power cord into the unit and into an electrical outlet and turn the pc on with the little button on the front of the unit.
  5. Okay, I did follow the tutorial for the paper clip trick and nothing happens.
    So am I correct in thinking that it is in fact the power supply that has gone bad and needs to be replaced?

    If that is the case, now all I need to do is to find another psu that will fit into that tight space. I did come across a few sites that do list that they have a power supply unit for the HP Pavilion 7865.
    and the one at looks just like the one that is in there now and they do list that it will work with HP but I would need to contact them first just to be sure that it is in fact compatible with the HP Pavilion 7865.

    Or is there something else that I need to be looking at for my replacement psu?

    Thanks Again for all the assistance.
  6. Best answer selected by lnjr.
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