It's a ground loop.
Plug in the monitor power with this:http://www.adorama.com/ZZAC32.html?gclid=CNvj0bvo5rUCFYxDMgod7T8AnQ
Use the adapter to lift the third pin from the monitor power plug.
I just looked up what a ground loop is and now I understand what the problem was. I just needed to rearrange where things were plugged and now the problem is gone. Thanks for the help.