Yamaha Montage 8 main board

Hi Gurus, My Yamaha montage 8 isn’t powering up,I checked from the socket down to the input and output of the power supply and it’s ok, There are no visible burned parts as well.
Pls could this be a main board problem? And is there anyway to troubleshoot a main board issue?

Please I ll appreciate response from anyone.
Thanks in advance