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Re: laptop causes noise when plugged in to AC - anyone else?



I had this exact problem on an older HP laptop. Everytime a uplugged the 
power and let it run on batteries, the hum/noise would go away.  I finally 
talked to a radio DJ who told me the solution. He bought a cheap RFI 
filter 
at Radio Shack, and the problem went away.

Kris