Seriously weird problem with Dell 2001FP

[JustPlayingSmart]

I'm posting this on 2+2 because there are so many people who have this monitor that maybe someone else has experienced this problem. I bought a Dell 2001FP monitor a couple days ago that I plug into the DVI port of my Radeon 9200SE video card. I have it as the extended 2nd monitor on my computer. Right now it is set at 1280x1024 resolution. When I change to 1600x1200 resolution, my Linksys wireless internet connection becomes unavailable. My computer is 10 feet from the wireless router, and as soon as I change back to 1280x1024 resolution, the connection comes back. I have reproduced this problem several times, so I am almost certain that changing the resolution is the cause. Any ideas on how to fix this problem?

Edit to add: my primary monitor only supports a maximum resolution of 1280x1024. I don't know if that makes a difference.