Blank DVDs won't mount

My iMac mounts DVDs containing content, but ejects blank DVDs without mounting them. Same problem with CDs.I reset the PRAM, but this did not cure the problem. Anyone have any other suggestions? Does my iMac need repair?

You need to check what DVDs your player/recorder can handle.
Go to the System (apple) menu and choose ‘About this Mac’ then click on the ‘More Info...’ button.
In the contents column of System Profiler choose ‘Disc Burning.’
Now look at CD-Write and DVD-Write and Write Strategies in the right hand pane. These are the types of media you can use. Many iMac G4 units could read, but not write DVDs.
If your iMac can write to CD/DVD,  you are using the proper media format, and your drive STILL will not burn, then the burn lasers may be malfunctioning or dirty. Try using a CD/DVD cleaner (actually, a spinning brush) to clear off dust and dirt. If that won’t work, then you probably need to replace the drive.

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