My son's PS2 (silver, out of warranty by 4 months ) is no longer reading any discs (games, dvd, cd). Sometimes, it manages to read the intro and hangs (for want of a better word), and other times it comes up with the message:"unable to read disc". I've tried using a cd cleaner to no avail. Can someone pls advise on what I might do to rectify the fault? Thanks.