As JCBTubes noted, try getting an inexpensive groundbreaker before spending a lot of money on the "MAGIC" unit or MIT's IsoLinQ Groundbreaker unit. Radio Shack carries a groundbreaker that's decent -- I'd start there.
Whatjd- Try an in-line transformer. They usually go by the names of "Ground Breakers" or "Hum Eliminators". You should be able to find them for less than $20 at any a/v store that specializes in home installations. There are better built units at audio/videophile prices, but try this first to ensure that this solves your problem. Good luck.
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