CD's & DVD's eject w/o reading, and no external USB drive recognition

We just recently got a "newly refurbished" 15" PowerBook G4, and it's got issues with the CD/DVD drive. As soon as you put the disk in (CD-Rom, R, or RW, DVD-Rom) it spits it out about 3 seconds later. Can't figure out why. We also have an external hard drive that works great with our eMac, but no jo with the PB.
Any ideas? I've tried doing a system update, but no luck there, either. Thanks!

Can't return it. Got the computer through someone on Craigslist. Maybe that was mistake #1...

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