I decided to plug in my older dell monitor into my Radeon 6850 since it has a second DVI. The monitor will not work and gives me the "cannot display this mode" message. The PC is not recognizing the monitor nor is the video card. I tried reducing the resolution but that was futile. The monitor is a 6 year old 15 in. My current monitor is a new 24". The ATI control center does not see the monitor. Any suggestions? This has got to be something simple that I am missing.