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Power supply/ Motherboard issue

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5 replies

by blacksky82

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Hey everyone,

I have my brothers HP Desktop which is not powering on at all. It was fine yesterday then he unplugged it after powering down and now it will not turn on.

I went to HP's sight to t/s this issue because it has a Bestec power supply. This supply has a a led (flashing when all connections made) on the back to show power.

On the site, it says to remove all connections if there is a flashing LED then the power supply is bad.
The LED stays lit with no connections. I connected the mother board and the led starts flashing. With the hard drive connected and peripheral drives the light remains steady if the mother board is not connected.

I think the MB may have been fried, as according to the website, the power supply is good.
And if so is the processor, assuming it is not the problem, reusable? (sort of new to actual hardware)
I appreciate the help!

5 replies

by mjd420nova

Try unplugging the fan on the CPU first and check the LED's. Then unseat the CPU with the fan plugged in and check the LED's again. That should provide the clue if it's the CPU, fan or MOBO.

by oh smeg

[i]I went to HP's sight to t/s this issue because it has a Bestec power supply.[/i]

Is this the HP supplied PS or an After Market one? If it's an After Market One why look up the HP Web Site?

AS for the CPU, RAM and anything else on the M'Board being reusable if the M'Board has died thats anyones guess as depending on what destroyed the M'Board anything is possible. However if it has failed because it was allowed to overheat the most likely scenario is that the M'Board is shot and the other things plugged in or connected to it are OK. However if it was a Power Surge that took out the M'Board and the Power Supply is still working it's most likely that the entire computer is shot as the PS is not performing it's job and filtering the Mains and protecting the rest of the computer.

Most times the PS gets shot and should protect the remainder of the computer. However with Cheap Power Supplies this isn't always the case and when they die the remainder of the computer is also destroyed.

Col

by blacksky82

Yea the power supply is the stock ones that HP sent with the PC. The pc was working fine, I turned it off to take it to another room. Proper shutdown, and when I plugged it back in nothing. The led began flashing (power supply) and I looked it up not knowing what the flashing meant on this PS. The ram and video cards and nic card work in my other pc along with the HD and peripheral devices also. the only time I get the power supply issue (flashing led) is when I actually plug in the motherboard power connector. I think the board may be shorting and drawing complete current to ground. Ill try re-seating everything.

by oh smeg

Try looking for something between the Case and the back of the M'Board. Quite a lot of rubbish gets sucked into these things and anything that gets stuck between the M'Board and the Mounting Plate can cause a short Circuit.

Also check with another Power Supply as it's possible that the PS is claiming that it's working till a load is placed on it when it falls over and fails to produce enough current to run the computer. As ATX power supplies are always on and use a Ripple to switch between Off & On there is always a load on the PS whenever it's plugged in.

Re items working if the majority of the Plug In Items are working then it;s more likely that not that the CPU & RAM will be OK.

Col

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