Question Changed CPU thermal paste, now PC won’t boot

[Judwan]

I’m a bit baffled with this one, I just removed my CPU to replace the pre-applied paste with some Arctic MX-6 and the mobo (tug gaming b650 plus) is now displaying a red LED indicating a CPU problem.

I took the AIO pump off, checked all the pins, checked that the paste was evenly spread, re-applied the paste, secured the pump in place and plugged it in. The PC starts up fine, all fans are spinning but no display.