Board manual recommends using G.Skill 2x 2GB in the yellow slots, but you could try to enduce a post beep with no memory GPU/drives installed, just the board, PSU, power switch and make sure the internal speaker is connected. No ram beep code will be a long beep with two short beeps. If you don't get a beep code with no ram, it's pretty much down to the CPU or motherboard being faulty.