It is best to try the steps below.
Try to do a CMOS clear of the board.
Put the bios jumper to the maintenance mode.
Boot the system with minimum configuration (the rest disconnected)
PSU + Motherboard + CPU + 1 Memory Module only.
Put back the jumper to default position when done.
If it is not booting, remove the memory to check if the board issues any beeps
Then last thing to do is to recover the bios using the Recovery Method
If you have any other CPU, test it.