Have you replaced the CMOS battery??
Before starting up an old mobo, the first thing that needs to be done is to replace the old Cmos battery, since the BIOS of the system has long been dead.
A new battery will help it remember cos of a fresh flow of juice thru the brain, not doing so, causes the weak or dead Battery signal to corrupt the bios, leading to total failure.
Disconnect everything from the board, replace the battery , plug in the processor and jump start it
You'll surely get a beep.
Then continue with adding the peripherals in after switching it off and go ahead with the setup.
Let us know if this helped and get back to us with a further update.