No video

Hello,

I recently had a problem withmy system randomly freezing . in an effort to correct this I began to format and relode windows xp. after installing the os I began to install my 3rd party hardware and during a routine "you must reboot for the changes to take effect" on reboot i got a no signal mssg from my monitor and have not had a picture since. So far I have connected the monitor to another pc, it works, moved my graphics card to another pc, it works, and replaced the cmos bat. I am out ofg ideas. Can anyone help me fix this or confirm it is my mobo so I can just get a new one and be done with this?

Thanx in advance for your help
Drew