Movie DVDs not being recognized

Hello, forum folks.
I’m posting about a problem with my family’s eMac. It has a combo drive and the CD reading and burning is working just fine. However, it will -not- read DVDs. The family’s been trying to watch purchased DVDs, but the computer just ejects them after a few seconds. We’ve tried opening Apple DVD player first, but the same problem occurs.
The computer is running system 10.4.9. I’ve repaired disk permissions, but it hasn’t helped. Thanks in advance!
eMac   Mac OS X (10.4.9)   Family's unofficial, untrained tech support.

Nevajas,
Welcome to the Apple Discussions!
Have you tried running an CD lens cleaner through the drive for a few passes? Since CDs and DVDs operate at different wavelengths, there are separate CD and DVD LED lasers and lens inside a combo drive; it's possible the DVD lens has a buildup of grime but not the CD lens.
Also, check System Profiler and confirm that the optical drive is still recognized as being a combo drive.
You can add the CPU speed (and amount of RAM, etc.) to your user profile to help determine what other steps may be helpful. For instance, depending on your eMac model, you may want to see if Superdrive Firmware Update applies to your model (it's not too likely, since that references Superdrives and yours is a comb drive, but if the update isn't applicable it will say so and refuse to run).

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