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No valid disk message?

No valid disk message appears onscreen when a DVD is inserted into my portable Venturer 7in dual screen in car system. I have tried several disks.
TG, January 2009
Answer to Colin's question - No, they are genuine disks
The player worked for about 6 months

TG, January 2009
Are they copies? my dvd player is very fussy

Colin, January 2009