I got a 12" refurbed powerbook a few weeks ago. If i run my finger around the seam where the battery and the powerbook meet, I can feel that the battery is slightly higer than the body of the machine. No big deal. My problem is that my powerbook rocks a little on a flat surface, and I think this may be the cause. When it's sitting on a flat surface if I push on left front corner the whole machine rocks a little (maybe 16th of an inch). The reason this is a problem is that my left hand sits on the palmrest and the machine tips back and forth while I type, which as I'm sure you can imagine is quite annoying. Is the battery the problem? Is the body of the machine warped? Should I take it to the apple store and have them look at it? Would they even help?