You could try running it trough a UPS to see if that cleans up the 
power, or you could go to Radio Shack, and buy a ground loop isolator 
for about 15 dollars. They are made primarily for autos, but I have 
successfully used them on a AC circuit. Finally, you could eliminate 
the ground with an adaptor, which would probably be OK for short term use.

Mark Rode
The Nospin Group

>>A friend of mine just purchased a new HP laptop for the express 
>>purpose of playing music at square dances. We discovered that the 
>>power supply is generating noise when he tries to play the music 
>>and also when he tries to copy music from his record collection 
>>(old 45's). What can be done other than running the laptop from its 
>>batteries (which won't last long enough for and evening's music)? 
>>There is no ferrite bead on the power supply lead. Would that help? 
>>Any other ideas?

                         PCBUILD's List Owners:
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                        Mark Rode<[log in to unmask]>