If you replace the CMOS battery. It's funny, but I know of such cases. Next, check the power button on the case. Complexity hides behind simple. And finally, remove the CPU cooler, turn on the computer and check if the CPU heats up.
It’s not in the case currently. On a non-conductive surface on my workbench. I’ll try replacing the CMOS battery. With the CPU plugged in the mobo is not powering up at all, so I doubt it would get hot.