computer boots monitor no signal

Hi Everyone,

I wiped the harddrive on my pc. I plugged in the monitor and of course I get the "Self Test", "Check PC Cables" and "Monitor is Working". These are the things I have tested and tried:

All the cables (tight and works)
Hooked the monitor to the laptop (works)
I can boot the pc, everything is running
I booted from the XP CD
All lights are on the pc (power, drives)
I have checked inside.

Does anyone have any suggestions for me?

Thanks