Dear all, I just recieved my new yamada 6600. However quite surprisingly I am able to play most media (DIVX, MP3, JPEG,...) but I have problems with common DVDs. Some of them are not recognized by the reader and I got the message NO DISC. Please note that I am talking about original DVDs, not burned by me. I have disabled the parental control and upgraded the firmware but still nothing. These DVDs work with no problem on my other DVD player. Should I return the unit or there is something I can do ? Thanks for your help!