PC wont boot after power outage. Sign of dead Motherboard?

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wh33lybrdy

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Oct 21, 2013
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Recently helped my younger brother build a PC. Got it running and it was working just fine for about two weeks. Last night a nasty storm rolled in and knocked out the power for about 30 seconds. When the power came back on my brother unplugged the PC (which was off) from his surge protector in case of lighting or something just to be safe. He went to plug it in today after all the storms had passed and it would not boot. No lights,no fan spins, beeps or anything. Thought it could be the PSU and tried the paperclip test, PSU starts up and runs fine. Its seeming that the MOBO is not providing a power signal to the PSU to turn on even when using the on-board power button. At this point im thinking the MOBO is dead. Would it be eligible for RMA? It is not overclocked and has no signs of damage (I looked it over for popped capacitors and warping). At this point im wondering if there is anything else I can do or if I should just RMA the board.

Specs:

Intel i3-4360

Asrock z97 Extreme 4

Corsair CX500 M

Kingston 8gb RAM

Sapphire 270x
 
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westom

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A power controller decides when a PSU power cycles. It takes many inputs to make that decision. Any answer that is useful (not wild speculation) first requires numbers from six wires using a digital meter and one minute labor.

Your choices are to keep replacing good parts until something works (and not learn how to avert future failures). Or follow the evidence. Get a digital meter and instructions to first provide numbers from those six wires. A latter solution means a suspect is clearly identified immediately. And why failure happened such as the most common reason for most failures - manufacturing defects.

You have no reason to believe a power supply is good. Power controller could be detecting a bogus PSU and shutting down. Paper clip test can detect some bad PSUs. But will not report on the entire power system (more than just a PSU) and cannot even define a PSU as good. For that, numbers are required.
 
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wh33lybrdy

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I understand what youre saying but I also tried the MOBO with a known working PSU and still got the same results. We've already exchanged the motherboard at Microcenter since it was under warranty.
 
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westom

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Appreciate why confusion exists. Parts were replaced/swapped without first identifying a defect. A meter would have averted all this work in minutes.

Best reason to fix something is to learn. Demonstated by example is why good diagnostic procedure identifies a defect before swapping anything. You can start over again with the meter. Learn what exists before making any more conclusions or changes.

 
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westom

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Using a meter, as discussed previously, would either exonerate or accuse that supply. Without even disconnecting one wire. Using one minute of labor. And without any speculation. Meanwhile, a meter would also report on many other components of the power system. Including how various components are interfacing.

If a fault is discovered, numbers may also identify why that fault exists. Better is to identify a fault before accusing anything only on speculation.

 
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damric

damric

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Sep 17, 2010
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sometimes the 1's and 0's get mixed up in the wrong order. CMOS clear loads up what's on the EPROM :D

 
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wh33lybrdy

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Sorry to revive this dead thread but it seems this is a common issue for many Asrock z97 extreme4's. Take a look at this reddit thread where it is discussed even more: http://www.reddit.com/r/buildapc/comments/2jrt1b/psarequest_possible_reoccurring_problem_with_the/
 
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