Replaced defunct PCU.

Hewlett-packard Pavilion m7480n desktop
September 23, 2010 at 09:22:52
Specs: Windows XP Media, 2
Get 60 Hz hum over the speakers, even with power switch off. Get message on boot: "No Hard Drive Detected." Will not boot XP repair disk. Machine is HP Pavilion m7480n.

What's next? Do I need drivers? Are their conneorrect?ctions that might be inc

See More: Replaced defunct PCU.

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September 23, 2010 at 11:23:29
Did you do anything that may have caused this problem? Change any hardware or mess with any BIOS settings?

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September 23, 2010 at 14:02:42
As far as the hum goes, if you unplug the speakers from the computer do they still hum? If so you have a bad filter capacitor in your speakers power supply. If they stop humming when unplugged from the computer, you have a ground loop problem. You will need to use a ground lift adapter on your speakers power supply.

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September 23, 2010 at 19:00:24
no changes except PCU.

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