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HP dc-7900 small form factor no power hearing some speaker noise

HP dc-7900 small form factor
Microsoft Windows 7 (64-bit)

Hi guys, i got 2 of these hp dc-7900 small form desktops to repair. Both of them has the same problem. it worked all fine and well for 2days, then nothing. No power, no lights, some speaker noise when power cord is plugged in but nothing. could any one help??

 

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HP dc-7900 small form factor no power hearing some speaker noise

It is unusual for two computers to have the same "power-supply" problem.

 

Do you live outside of the "first-world" countries, where the power utility has problems, such as "spikes" and "brown-out" issues?

 

Do you have a power-bar with built-in "surge protection"?

Do you have a UPS (Uninterruptible Power Supply), to provide "smooth" power to your computers?

 

I would take a "temporary" power-supply from a non-HP manufacturer.

Temporarily connect it to your HP computer's motherboard -- just the "main" connector, no power to the CD/DVD/disk-drive.

Connect the computer to the UPS.

Turn the computer on, and see if the "known-good" power-supply works.

If not, then it's possible that the problem is in the motherboards, not the power-supply.

 

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HP dc-7900 small form factor no power hearing some speaker noise

Thanks for your reply. tried all what you suggested but nothing worked. I'm thinking its  a bad MOBO because i tested the power supply and it works. so i'm getting one off ebay and i'll update you guys.

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