Mainboard not booting (cooler master case)

hello kind people,

I assmebled my cooler master case with the intel 11th gen cpu, ram and ssd just fine. Now I have trouble powering on the system. I’m pluging in the USB C cable from my Anker 65W GaN Prime charger directly to the board as I don’t have need for a usb-c module. However on the mainboard only a blue, green and small red LED turn on. I tried all the slots and once I had the system running yesterday but it won’t turn on now.
I appreciate some pointers where to look. The board has been on power supply for more than 24 hours and all components have been checked to be correctly set.

Kind Regards