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If a PSU is failing, does the motherboard receive any power?

by -JZenker- / January 24, 2013 7:00 AM PST

That was hard to fit into 60 characters..but here is the full question. If my PSU is failing , or next to death, will it at least send enough power to the MOBO to make POST beeps? Also the CPU won't turn on or show anything on any monitor, nor any POST beeps.

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All Answers

Best Answer chosen by -JZenker-

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Costs and up and running
by Willy / January 25, 2013 7:01 AM PST

For a seasoned tech, you should know that "various voltages" are supplied from the PSU. Besides trying to measure any, the usual result, is maybe fans or CD drives open and close, suggests that 12V is OK. However, it takes 5V and below to run the logic, etc., thus it acts up. Overall, there's no time to fiddle with it if you can swap it out. I've tore down many a PSU and rarely are they fixable or want to. Overall, it's a waste of time and effort unless it has to be done. It's just the way to go. good luck

tada ------Willy Happy

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Answer
Maybe. But I don't like bad PSUs. Why?
by R. Proffitt Forum moderator / January 24, 2013 7:44 AM PST

When PSU fails it can do so in a way that fries all parts connected to it. That's why your seasoned tech will remove a suspect PSU and your grey haired may finish the job with a big hammer or cut off the power leads.
Bob

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Who likes a bad PSU?
by -JZenker- / January 25, 2013 2:28 AM PST

Fortunately, I am that seasoned tech. I was just running some test on an old A Open model cpu, and this question came up so here I am. But I swapped it with a new one, and heard the wondrous beeps. Thank you for your input though.

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