Question about HP Pavilion 520N PC Desktop

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Regarding turning on my HP pavilion 520n, I have noticed that there are no obviously blown capacitors, and that the green led on the back which is lit when I plug it in, shuts off when I push the power button. It will come back on if I hold the power button on for about 8 seconds. Does this further confirm either the power supply or motherboard is suspect? thanks

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Difficult to say at this stage. If the fans on the PSU spin when the power button is pressed in and held, it would indicate that there is power to the PSU, but that does not rule out a faulty PSU

I'm suspicious about the fact you need to hold in the power button, which is normally a way of switching OFF the computer.

Might I suggest you try the following:

1.) As suggested before, remove the power switch connector to the Fpanel header on the board (should be labelled PW or pW switch). using two single pin connectors on the end of a piece of wire, connect them to the pins (does not matter in which order). Plug the computer in and touch the ends of the wires from the pins together briefly, if the computer boots, then the issue lies with the switch aseembly. If you are unhappy about doing this, you can use a multimeter set to the ohms scale and place one probe in each of the wires that go to the switch. Press the switch and hold it and see if you get a reading.You should get a reading and this will drop as soon as you let go the switch

2.) Replace the power supply and see if that works. This is the second cheapest option.

3.) If a new PSU does not work, then the issue must lie with the motherboard. I'm assuming you have already checked that the main multi cable is FIRMLY in the socket and the subsidiary 4 pin Black and Yellow cable is in the seperate socket

Posted on Dec 28, 2010

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