Sounds like magnetic intereference between the monitors. Try degausing them, and keep them as far apart as possible. It's unlikely to damage your graphics card, although it could the other monitor with prolonged usage.
tried deguassing the dell, many times, but, the packard bell has no OSD, menu, or any options (including degauss). yes, i thought it was magnetic interference aswell, but, it is settled now, somewhat atleast, i have gotten the ATI controls working, my tv is now running as second, works ok, i just wish i could figure out how to set it in a resolution lower than 8 X 6, but, there appears to be no way to do that. so, for now, the monitor will collect dust on my desk, my neighbor said that she would try to come up with one, she seems to be good at finding old parts that are no longer used. only thing that i do not like at all about this card is this: you CANNOT have two monitors and a TV hooked up at the same time, you can either have two monitors, or a monitor and TV. never both. so i wil have to pop my old nvidia MX4000 in for a second monitor, i will not touch the onboard video, it seems to have dissapeared since i installed the ATI card, i dont want to risk messing up the ATI config or drivers, i dont need any other problems right now. i guess i will just use the microsoft drivers for the nvidia card, they do not allow for openGL, but, i doubt i will be running anything that requires that in my second monitor.
oh, another question, there is a strange residue on this dell monitor, was like that when i got it, it is quite annoying, the monitor shows the red green and blue pixels as if its wet, but, the residue is dry, and will not come off with windex, greased lightning, or anything i have tried. if anyone has any ideas on how to get this off, tell me, the glare is increased alot by this residue, it is quite annoying. thanks in advance.