Since threads like these are few and far between, I thought I'd share. Screen on my new MB was intermittently dimming. I thought it was me but the girlfriend confirmed it was dimming. Made a genius appointment for noon. Called my name at 12:05. Explained the situation to the genius and he looked over the unit. Of course, it didn't dim. He said, "I believe you, we'll swap it out for another." I said I wanted to check out the build quality before swapping. Brought a unit out and it was fine. Asked if he would just swap out the hard drives to make it easy. He said, sure. 10 minutes later, I was on my way with a brand new MB. Got home and realized he forgot to put restore discs in my new box. Went back to store to get them. He couldn't apologize enough and then gave me back the old Magsafe adapter. He said, everyone can always use 2 of them.