my boy has the old ps2 and it had this problem so i opened it up hoovered out the dust greased up the two rails the laser runs on (sonys grease dries up with dust) tweaked the laser using a tiny philips tested discs while tweaking  put it backtogether  and my boys played it now for over a year  no problems                                                                                 if this doesnt work buy a slim ps2 (keep the receipt !)
                 yoda
                
 March 2007