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Psu died, replaced and now the computer won't boot properly

I have a p5w DH Deluxe mother board and my PSU went bad overnight. After replacing the PSU, the motherboard now powers up whenever i turn on the PSU, but doesn't actually boot. the power switch seems to be inhibited, as i cannot hold it in to power off the computer and the problem still occurs after i dissconnect the switch from it's pins. i am suspecting a problem with either the mother board or my processor and was caused by dirty power as my PSU died. i have a temperature sensor on my heatsink for my CPU and it actually measures a decrease in temperature when the fans are active, which leads me to believe that the CPU is not receiving any power. i need to find a way to check the MB and CPU without actually removing the CPU from the MB... my heatsink is kinda a pain to get on and off, and i can't afford to replace both on a whim... i need to know what is causing it before i can move forward. also, this PC is used for my business purposes, so i need it repaired quickly. thank you.

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  • adalast Nov 21, 2008

    luckily my contractor decided to pay for the repairs, so i'm just replacing both the processor and motherboard for upgrades (lucky me). i will be looking over the motherboard after i get it out, as i can always place it into an older case i have laying around and just have a better computer at my fiance's place.

    the power supply went bad while the computer was on, so i'm pretty sure that it did damage to both of them. i have rarely seen a power supply go bad without baking the mother board as well, though if i cannot find any capacitors that have a problem i will definitely try flashing the bios... the worst that can happen is that i mess up the bios and the computer won't work, which is exactly what i have now, so no harm.

    thank you very much for the speedy answer, and i will be sure to put it to use once i get it out of the case.


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You might try clearing CMOS as it may have been corrupted.
Had a similar problem when I was testing alternate CPU were board is "auto configure". Worked well when stepped up, but not down and then didn't want to boot. I would be looking very closely at "ALL" the capacitors on the board for swollen or popped cap's possibly from previous power supply defect!
Just because it turns on doesn't meen it will work.

When you say your PSU went bad over night it's a bit speculative since the problem likely started sometime previous. The real question is now how much damage and did you visually inspect everything? If it was off prior to discovering the dead PS you likely don't have CPU damage. You may also have chassis intrusion detection which could also lock you out!

Power switch should be related to bios settings for standby power management options. You can in most cases preset for soft off. sleep mode, standby.

One other suggestion; you might make sure your power supply is sufficient power for the load of your system!

Hope the information helps though I specialize more in mechanical controls but make sure you have power supply unplugged and discharged before you start playing and exploring the board!

Posted on Nov 21, 2008

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