Imac will not read cd or dvd in optical drive

When loading a DVD I get the following message "A valid device could not be found for playback [-70017]
I have tried to read a DVd perviously viewed on this machine  and it is not showing on the finder window.
If I open Disc Utilities I can see the disc correctly displayed.
Any suggestions

I had the same problem on my iMac. I followed the instructions at http://discussions.apple.com/thread.jspa?threadID=2020977, (Klaus1)
i.e. I used the disk utility to restore file permissions and - after a restart - it solved the problem.

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