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Question: Help re JVC TH-G41

Have brand new JVC TH-G41, cannot play Audio Cds, movie dvds, whether they are burnt ones or bought ones, have tried about 8 or 9. Ipod plays fine, as does radio. We have used the troubleshooter at back of instruction manual and put in area code AU for Australia. Really not sure what to do now, When disc insterted says reading, but then comes up with disc error or no disc and door opens. HELP PLEASE