Unable to read/recognize burned DVDs?

I'm having some issues playing DVDs on my MDD G4. The computer did not come with a SuperDrive, but I installed one myself several years ago. (I'm not remembering the specific brand of the drive I used offhand, but can look it up if it matters.) I moved the ComboDrive the computer came with to the second drive bay.
I'm able to play CDs (store-bought and burned), and store-bought DVDs. But I don't seem to be able to play burned DVDs -- including a pro video I purchased and DVDs I burned myself with this very drive! The computer just doesn't seem to be able to recognize or read the discs, and ejects them (or simply does nothing and the disc doesn't show up in the finder). The problem exists with both drives.
Can anyone help? Thanks in advance!
Erin

I have a pretty similar problem. I burn a DVD-R with Toast Titanium 8 and right after i burn the DVD it mounts at the Desktop and it shows the data just right.
After I eject and re-insert the same DVD again ..... after several seconds, the drive ejects the DVD.
I have installed 2 drives, a superdrive (Pioneer DVR-160D) and a combo drive (Phillips CDD5301) and the same DVD does not show on both Drives.
If i take the same DVD to my older Powermac (G4-400) which have installed a superdrive (Pioneer DVR-150D) the same DVD mounts right and works without problems.
I really can't find how to resolve this problem.
Thank you.

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