So I was playing Counter-Strike, and was messing around with the resolutions on the game. I forgot which resolution I switched to; it was some where around the 7XX by XXX. Anyways, after I changed to that resolution my monitor went black screen and gave me a message saying, "Frequency Out Of Range". Even though it's black screened I can still move the mouse around and here the sound effects but I can't see anything. I'm pretty sure that it's the resolution I changed to because my video card (GeForce 7900 GT) doesn't support that resolution. Anyways if any one of you guys could help me out, that would be nice.