Imac 10.4.11 won't read dvd-r....

that were recorded on dvd recorder . older dvd recorder..panasonic... one of first available..about 5 years ago. discs vary, many are fuji and tdk. speeds vary. but they're DEFINITELY dvd-r's, which i thought was the native system on the imac. why won't they play. i get a message that a blank disc has been inserted

first, thanks ever so much for taking the time to respond and try to help me on this matter. yes, they were finalised when they were burned on the dvd recorder (this is a "component type" dvd recorder made about 4 years ago by panasonic before all computers came with a dvd burner). they play in the dvd player they were recorded in (the machine was one which transferred vhs's to dvd) and an older windows machine. as far as format, i not sure of the meaning of format here----they weren't made on any pc, just a dedicated appx 5 year old panasonic dvd vhs--dvd recorder. thanks again for your time and attention

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
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After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

Imac 10.4.11 won't read dvd-r....

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