What version number is the motherboard? Version 1 or Version 1.1?
Version 1 requires BIOS of "F1" or newer.
Version 1.1 requires BIOS of "FB" or newer.
If all you are connecting is the power supply, motherboard, CPU and the monitor. And you do not get a post beep.
(assuming your monitor has a speaker or you are using a motherboard speaker)
Test the power supply voltages to rule that out.
Try the monitor on a different system to rule that out.
Then it is either the motherboard or the CPU that is bad. Swap one of those out to find the bad part.