crazyswedishguy wrote:Out of curiosity, does anyone know if there is any chance this helps eliminate ground loop?
No, this should have no effect on ground loops.
First, try plugging your guitar amp and laptop into the same outlet, that should minimize any ground loops.
Second, most laptops are NOT grounded through their AC adapters, so I wonder whether your problem is really a ground loop, or perhaps something else. (You don't tell us the symptoms, you have just diagnosed "ground loop" on your own.)
Third, charge the laptop, unplug it from the wall, and run it on its internal battery. That will completely eliminate any possible ground loop, because the laptop will not be grounded at all. If this does not eliminate whatever problem you're having, then the problem is NOT a ground loop.
Finally, ignore those previous posts about diddling with the power wiring, holding in the "test" button on a GFCI tester, etc. I don't know what that poster is trying to "fix," but those procedures have nothing to do with ground loops. There will always be some potential (voltage) difference between the ground pin and the neutral pin on a three-pin AC receptable. That's normal and is not the cause of ground loops.
A ground loop is caused when two (or more) devices have their chassis connected to ground through two grounded power cords, and then also have their chassis connected together through the shield of the audio wiring. The actual loop could be described like this: ground pin on device #1, through power cord on device #1, to chassis on device #1, through signal (audio) cable to device #2, to chassis on device #2, through power cord of device #2, back to ground pin on device #2... at which point it is connected to ground pin on device #1 through the power plug.
Note that the POWER connections (hot and neutral) don't come into play at all... just the third ground pin. So, if both electronic devices do NOT have a ground pin (and most laptop power supplies do not) then your problem can't be a ground loop... it is something else. If either device (or both) are powered from two-prong wall-warts, your problem is not a ground loop. (As I said before, we don't know what the symptoms are, or why you self-diagnosed the problem as a "ground loop.")