Ground loop isolator not removing the hum from my feed.

[ffemt601]

Having your pc and your scanner plugged into different UPS's could pose an issue.

 

[matthewtomek]

I had a problem with a hum on one of my scanners. I ran a ground wire from the back of the scanner to the computer case and it solved the problem for me. Try running a ground wire and see if that helps any.