Please help, monitor trouble

I recently took my Hitachi LCD monitor to a LAN party and when i brought it back and hooked everything back up, all it displays is a grey screen. It has signal and power. It is not a system problem because i am using an old e-machines monitor now. Any help is appreciated :)
 
If it has both VGA and DVI have you tried both?

Does your comp have dual monitor support?
 
I have only tried the output on my video card and i don't think that my comp has dual monitor. Maybe it just got damaged on the trip...
 
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