Hi,I am a newbi on here but have read some of your stuff for a while.I can confirm that the 7 "0s" unlocks this model.I have developed an odd problem with this machine,it will play and record tape .It will play audio CDs and it will even play the head cleaner which has pictures as it runs BUT it will not play any other DVDs.Every disc I try either home recorded or commercial gives the same error message--Unknown disc,please check disc again.Any one got any ideas or can point me in the direction of some help.Thanks in advance.