Unable to read DVDs on iMac G4

iMac G4 Flat screen, OS 10.4.10
I can burn CDs abd DVDs using Toast Titanium 8. All these DVDs are read on other computers including PCs.
However, my iMac G4 simply ejects the DVD. CDs are read OK but the DVDs are a NO GO!
I do have a Super Drive that has worked perfectly in the past. This phenomenon is NEW.
Is is possible that it is dirty? What can it be cleaned with?
Is it also possible that the DVD Optical Drive has burned out?
If so, can it be replaced inexpensively?
Many thanks for your help.
Regards,
Dr. Mel Wilner

Have your tried a drive cleaning disc. The build up of dust can affect the much finer DVD laser/pits before the CD reading is affected.
<hr width="400">
Current iMacs, Mac Minis, MacBooks and MacBook Pros all have an 8x slot-loading Superdrive only. 18x DVD±RW DL External Firewire drives are much faster and will also handle small (8cm) or mis-shapen discs. If your issues persist I suggest you consider the investment. Given the slow speed and limitations of Superdrives in the current Intel Macs your investment will continue to be of great use even if you upgrade your computer. You can also choose to purchase a Lightscribe drive if that interests you.
UK.
US.
DIY internal drive replacements are about $35.
mrtotes

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