Hi, I loaned my old iBook G4 to a friend, and it has been returned unuseable, can anyone suggest a way to go forward? When the machine is turned on I simply get a grey screen with a small file in the middle with an alternating ? and the finder picture (two faces). The chap that borrowed the machine fancies himself as a bit of an expert on mac, but is clearly not. He was apparently trying to "upgrade" the machine. But cannot "remember" what exactly he did! Any ideas would be greatfully received!