I run into this problem a lot. First, you can listen to most radio stations online, a good solution. But, as far as the computer goes, most noise is RF, although the power line will help radiate it. Make sure its not the monitor. Flat screens are noisier than CRTs just cut off the monitor, see if the problem goes away. Also the monitor cable, many are poorly shielded. Most RF noise I find comes from 3 sources. One the monitor &/or its power supply. Two the video card. and three the microprocessor or its power supply. Try some clip on ferrite chokes on the video cables (both ends) and power cords on both the monitor and computer. If the computer is plugged into a UPS check that. They will also radiate. Robert