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Possible motherboard power failure
by Bryan
(Saco, ME)
I am deep into the diagnosis of a power problem that has led me to the brink of calling it "motherboard failure." Before I replace the motherboard (and essentially begin rebuilding the computer) I would like to know if there is anything else I can check:
Problem: Went to turn on computer this morning and nothing happened. It powered down fine last night! I went through all the simple checks of making sure the main outlet had power, all the switches in the correct positions, plugs securely fastened.
I then performed the following checks:
Check #1: I purchased a new power supply unit since that is known to be a common culprit. Nothing changed, although I noticed a single LED lit on the motherboard. "OB PWR" is printed on the board next to the light, and in the motherboard manual it says this is the "Onboard LED." Just to be sure (since the new power supply did not solve the problem) I switched the old one back in and lo and behold the LED was lit with the old supply as well.
Check #2: Since it seemed the power supply was not the problem, I moved on to checking the on/off switch. I perfeormed two tests here. First I used a continuity tester on the leads coming directly from the switch and it showed continuity when the switch was depressed. As a second check, I removed the leads from the place they attach to the motherboard and used a screwdriver to bridge the gap. Still nothing happened.
So now I am thinking the motherboard itself may be bad, but is there anything I can do to verify that it is in fact defective other than simply use the absence of a solution in the previous checks?
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From the Desert South West ~ Arizona, USA
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