In my case it was the PC and the two prong adapter fixed it. Our missing friend Mac told me all about it, there's no problem with using a ground lift when it's going into the surge protector. You know Mac, he went into his Electrical Engineer bag and explained it in great detail. If you're still not sure, I'll search my own posts, find his answer and post it.
This has been a while, maybe even last year and no problems and no noise either.
Bob
Hi Bob,
I have great respect for Mac, even though we've disagreed in the past.
I would be most interested in that post as I do not see how a surge protector would make a ground lift any safer.