Question – Help Please. Motherboard CPU light on

My first suspect is the flash got nerfed. Unplug the power cord, press the power button to discharge the caps, and let it sit for an hour. It is supposed to load the backup bios automatically. So hopefully when you plug it back in and press the button it will load the backup. Next use the clear CMOS button on the board. If it still won’t boot, you will need another system to download the latest bios and put it on a USB drive. Then you can use the Q-Flash plus button on the board to try to reflash the bios. As it does no require the CPU, GPU, or ram to work.

Still no joy? If your PSU came with a self power tester use it according to the directions. That will help determine if the PSU is at least working to some extent. As I’ve seen a fair number of owners have the Cooler Master series die prematurely on them. The RMA service experiences were mostly good, so that’s encouraging if you have to replace it.

Reseating everything is always a good idea too. Power cables, ram, GPU, even CPU. It could probably use new thermal compound or a thermal pad by now. It’s good to go barebones with no extra expansion cards or I/O stuff plugged in.

If nothing gets it to boot, the next suspect is the CPU. Raptor Lake is plagued by accelerated degradation. Perhaps you knew this and that’s why you were trying to update the bios?

Good luck. Let us know how it turns out if you come back to this thread.