Hi everyone, I have a strange problem. My MBP is fine when used alone, but If I am reading tabs online and playing my electric guitar, if I touch the case of the mac, and my guitar strings, I get a shock. It is not a big shock, but it is enough to know it is there, and if I keep my hand on it it is constant, not a sharp quick jolt, but continuos. As you can guess, this gets quite annoying when I am trying to learn a song constantly having a tingle go through my arms. Any ideas what I can do? I've also posted on a guitar forum, and got some help there, and it appears that my guitar is correctly wired. Any help would be much appreciated, Conan. EDIT: I just saw another thread that reminded me of something, I am using a non apple magsafe charger, if that makes a difference.