Custom PC with ASUS Z87-PRO locked in POST loop

by Rémy Roy   Last Updated June 18, 2018 20:01 PM

I have built this custom PC with an ASUS Z87-PRO 4 years ago. I have been using it since without much problem. I have upgraded some components over the years like the hard disks without any issue.

Yesterday, I removed the speakers system for a party. I came back to my PC, plugged in the speakers system back and powered on to find out that it was stuck in a POST loop. You can see a short video of the Q-Code LED information I'm getting. No single 2-digi error code stays on. They just keep rotating in this loop.

I can also see the VGA led, the CPU led and the DRAM led lighting up for a fraction of a second in this POST loop in this sequence: VGA, CPU, DRAM. I'm guessing POST is testing them when the led light is up. I'm also guessing these components are fine since the led doesn't stay up as well.

There was a storm this morning but I doubt this is an issue here. My PC is plugged into an APC Back-UPS Pro 1000 which should take care of power spike issues.

While I'm in the POST loop, my monitors do not show anything. They just remain black.

How can I start my investigation to solve this issue?

Any help or suggestions would be greatly appreciated.

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