I was able to run 11gpus without any molex

when i tried 12gpu it sometimes worked but caused windows to crash.. now i have tried with molex the mb is not working at all. no light on ethernet either. i unplugged everything did cmos reset over night still no light..

While i was trying the molex i did plug the wrong end of the pcie cable which did not start the second psu then i unplugged everything worked. Tried with molex for the last time then the mb not started since.

any pointers from experienced users please i probably damaged the mb somehow but it is always good idea to ask incase if there is anything else


(i tried with both psus no start. psu test does not spin the fan when 12pin is plugged to mb otherwise works fine. )
i unplugged ram, cpu all pcies everything  and only used one ram still no power or no light on ethernet. blown the fuse of the mb i guess ?

What else i can try before replace the mb?