z370 Taichi dead£

It sounds like you were the victim of a bad PSU. Unfortunately when it comes to
power related failures there is no simple troubleshooting. The board is getting
power as you noted but more specifically, the LEDs are getting power. That sadly
doesn't necessarily mean the board is OK.

Try clearing CMOS and pulling the CMOS battery with the system disconnected from
the wall for 10 mins or so. If a power safety system was triggered but didn't disengage
that could resolve your issue.

If the power button still doesn't work, you can try shorting the power on pins
on the boards front panel IO (where the power button connects). That will rule
out a bad switch.

I suspect the burned smell likely originated from the PSU but you can have a sniff
around the board itself, particularly near the heatsinks around the CPU socket.
If you smell burning there then the board is likely burnt out. This is the VRM
section of the board where power is converted for the CPU. The LEDs under the
chipset don't pass through this circuitry so they can still work even if a
VRM is dead.

I have rarely seen a CPU die from a blown PSU, motherboards tend to do a good
job protecting the more expensive (usually) component. It's quite possible the
previous board and GPU are not dead but rather the failing PSU was not providing
stable enough power for them to function. Different boards have different
tolerances for such things.

Good luck

Edited by Xaltar - 11 Mar 2023 at 12:26am