Do i have a bad mainboard?

My K1C won’t boot. When I turn it on, the power supply works (its fan works), and LED D4 on the main board lights normally. The other blue LED (D5) lights very dimly. No lights are flashing. The LCD does not come on.

I have tested 24v on the power supply.

Does anyone have any thoughts? Thanks…

Following…

Mine is doing the same thing today. The only difference between mine the OP’s, the inside light rail is strobing.