I suggest you dis-connect the hard drives to see if you can get into the BIOS. You might also remove the memory to see if you get 3 beeps from the BIOS when it can't find any memory.
If the motherboard has build-in graphics you can remove the card and try the MB video output.
Then you need to confirm that the CPU is compatible with the MB.
It could be that the CPU is fried. Since it is the common element.