Combo drive - ejects DVDS

The combo drive for my Powermac G4 (mirror drive doors, running 10.4.7) will play and import CDs just fine, but won't recognize DVDs. I've tried putting in various movies, burned DVDs, etc. and it just spins for a while and spits them back out. They never appear on the desktop and DVD player doesn't open.
What's wrong? How can I fix it?
Thanks,
David
Powermac G4   Mac OS X (10.4.7)   Mirror drive doors

I read elsewhere on the site about resetting the PRAM and that solved the problem. Drive functions normally now.

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