I moved into an apartment two days ago, and I've noticed that the monitor image is shaking slightly, and I'm guessing it's because of interference, because I've had that problem before, and I've been able to solve it. However, I'm not sure what the culprit is here. My monitor is a Dell/Sony Trinitron P780. Here are the electronics I've got nearby: Motorola SB5100 cable modem, hp LaserJet 1012 (although I didn't plug it in until today), U.S. Robotics 8003 router, Altec Lansing 2.1 speakers, and sonicare Elite charger and brush (you never know ). I don't think it's something in the walls, but I guess it could be. I do have a 2.1 speaker setup, and I think it could be the sub, because I remember reading a warning that the sub shouldn't be too close to the monitor, so the monitor is on the desk, and the sub is below it on the ground. However, I've never had this problem before in the past 3 years with that configuration. The walls aren't thick, but I guess even an electrical wire could cause interference. Can anybody help me out?