Hey, I have a late 2007 MacBook, I've recently been having issues with it. When I have the power adapter plugged in I get bad hissing noises form the sound weather I have speaker or headphones plugged in. I also have lines running down my external display when the power adapter is plugged in, I think the correct term for the issue is banding. Does anyone else have these issues, I know a lot of people use their macbooks as their main machnes? Is there anyway to fix these issues? Thanks.