It sounds as if you hadn't pushed the video card into the AGP slot enough but now you have.
If the cable from your monitor doesn't fit into the video card I'm going to guess that the card has one or two DVI sockets and the cable from the monitor is a VGA fitting.
So you need a DVI to to VGA adapter. Usually you get one or two supplied with the video card.
But I can't say for sure because I can't actually see anything, obviously.
If you could give us more info about the connectors, even a written description here, it may help.
If you think you can get more help on MSN, go right ahead.
Just let us know though so we don't waste our time with you.