after getting my powerbook back from apple care on startup a folder with a question mark on it which changes to a folder with the finder icon. This happens before the apple logo appears while the OS starts up. This never happened before sending it to them. it takes longer to startup than before and now runs slightly slower and warmer than before, but other than that it seems fine. any thoughts? Of course they replased a plastic clasp in the screen casing so why they felt the need to turn my computer on for any reason other than to simply make sure it started up the screen still is totally beyond me.