RGB no input signal

Hi all, yesterday i bought a pc from a friend i saw the pc working at his house on a 40" TFT HD TV, When i got the computer back home i hooked it up to my old 17" CRT monitor plugged into a DVI connector then the DVI connector plugged into a HD connector then into the HD slot at the back my computer, when i turned the computer on the monitor said, RGB no input signal, for some reason i thought that was because my old CRT monitor was just TOO old so i borrowed a 17" TFT monitor and tried it using that but i still get the same error. So now i've hooked it up to my HD TV using a HD cable and its working fine but i cant keep it on the TV forever, i'd like it to work on either of my monitors (neither are HD)

I've looked around on the internet searching the error i cant find many answers other than, check the cables.. which i have done and, the graphics card is broken but it isnt i've just been playing COD:MW2 on it, also read that it could be the resolution, it could be set way too high to be used on a small monitor. I've tried to change the resolution on my TV to the smallest then switch to my monitor but i still get the same problem. so does anyone have any other ideas i could try

Input type for both monitors are VGA. output for the pc is HDMI only, i havea dvi connector, i forgot to mention in the first post, i put my brothers graphics card in my pc nvidia 8600gt but i still got the same error with both monitors.

heres the motherboard i have.. http://www.play.com/PC/PCs/-/698/905...d/Product.html

i'm running windows 7.

scott