Help Setting Up an Old Rig

I have an old Pentium 4 processor, an Asrock Conroe-1333 D667 motherboard, an ATX case with 400w Power supply, and a DDR2 RAM module lying around the house, thought it was such a waste, so I decided to bring it back to life. I hooked everything up, I knew it was running because the heat sink fan was spinning as it should but there was no display on the monitor, no POST and no beep.
The motherboard had onboard graphics card so i tried plugging in my working GT220 graphics card from my current rig but still no display. I've tested out every hardware except for the motherboard and processor as I've got AMD build from my other computers.
Any suggestions to resurrect this old setup again?

