PSU may be giving you the issue. Also make sure you have the 24 pin power firmly seated and you have all the power connectors firmly connected and seated to the board (8 pin + 4 pin 12V power on your board at the top). Try swapping the PSU for a temp if you have all those connectors seated well.
I am NOT using the CPU fans headers on the motherboard for my water cooling solution.
When I boot up, I get this message...
"CPU fan speed error detected. Ensure that the CPU fan is is properly installed on the CPU_FAN header or adjust/disable the fan speed low limit option in option in the UEFI bios.
Press F1 to run the SET-UP."
Now I have placed the low fan speed to IGNORE on the two CUP_FAN headers. But still get this message. This wouldn't be the cause of the Q-Code 02 and Boot Led?