Hello! I apologize if this has been addressed in a thread elsewhere. I have a 2010 MacBook Pro (i7, 15"), with Snow Leopard. Recently I noticed that if I leave the computer on for a little bit, it will start holding down a button. (It seems to always be the "O" button so far.) I take pristine care of my keyboard, and use the compact air regularly, so I don't believe it's a hardware issue. Also, it seems to be fine if I restart it. I've repaired permissions, installed system updates, and checked for viruses. Does anybody have any ideas? Thanks for your help in advance.