Question Did brown out kill my CPU?

brianz

Distinguished
Jun 5, 2009
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Just had a quick flash brown out during storm. My otherwise perfect PC of just over a year, running an i9 chip on Asus ROG Maximus XII, seems instantly damaged. Still running with RAM RGB lights and fans, and I hear normal drive sounds during boot, but motherboard is giving me error 7F ("reserved for future use" per manual) which then changes to "Check CPU". Meanwhile, monitor display is blank, no signal. How do I even begin to troubleshoot this, short of swapping out the CPU?? Please help! I've done cold reboots to no avail, same result. Thanks for any suggestions.
 

brianz

Distinguished
Jun 5, 2009
52
1
18,545
1
Well I did a cold reboot again, this time with a full unplugging of PSU from wall, along with physically switching it off. Then replugged, re-switched to on, and did boot process... and it worked!! Almost had a heart attack. Doesn't look like any damage occurred, but it still seems like odd behavior for the PSU. I guess I should get a better surge protector.
 
Reactions: drea.drechsler

jay32267

Champion
It's possible there were caps that needed to be drained in the PSU....due to odd things that may have happened during the brownout.
I would just keep an eye on it.
If you want....you can check your voltages with HWInfo....or many times you can also check them in the BIOS.
They main voltages.....12,5 and 3.3.......should be within 5% of those values.
 

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