And please explain further what you mean by can't get past post. Does that mean you can't boot to an OS, or can't install an OS? Or does it mean you can't post at all, or can't even enter the BIOS?
Is the board starting at all, if so does it stay running, or does it reboot in cycles? Do you hear any error beeps, if so what are they? If not, please install a case speaker so you can hear the beeps if there are any.