Siedliner--

The safe and simple solution is available for 16.99$US at Radio Shack stores:

Ground Loop Isolator

Note that it uses RCA phono plug inputs and outputs, so be sure to pick up the right Audio Adaptors to place it between your laptop's earphone output and the PA's inputs.

This *will* safely cure that problem for you.

Incidentally, it is not a matter of laptop brand or anything of the sort. Fact is that *most* laptops will do this and it is due to UL/CSA etc. safety rulings as to AC grounding. Overkill, perhaps, but we have a great and safe solve in the Ground Loop Isolator.


--Mac