How Can I Eliminate Humming Sound?

[ddouglass]

Gwen, are you getting the hum when it is just the laptop (internal speakers) or are you getting it when you have the laptop plugged into your sound system (mixer, amp etc)?
And the Radio Shack item is called a Ground Loop Isolator. I finally found it on there website. Those will help when plugged into your sound system.
Another thing that can help is to make sure all your system items including the laptop are plugged into the same circuit.