It shouldn't be. If it's a required pin you wouldn't have even gotten a post beep code. It could be a bad motherboard also.

Try this:

Unplug EVERYTHING, HDD, CD-ROMS, anything else that is plugged in. Leave the CPU, RAM, Vid Card, and all power connectors plugged in (except for the parts mentioned first). Boot. What error code(s) do you get, if any?