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Laptop Hum

I'm have a Gateway laptop, using the Lexicon Omega for my I/O. I've used it for a while, including an Audigy 2 ZS PCMCIA card before that, both no problems. Then I decided I needed more storage so I bought a 300 GB Seagate external HD. Now I'm getting a hum. The hum gets louder if I turn the output level anywhere off of the half-way mark.