My iBook won't recognize my combo drive

My computer is acting like no combo drive exists. There are no drivers installed and my 'about this mac' tells me nothing is recognized. I put a disk in and it tells me "The disk cannot be used because the disk drive is not supported. (error code0x80020025)" What do I do?! Thank folks, you're great!
iBook G4   Mac OS X (10.4.3)  

That's what the tech guy over the phone said to do. Well when I took out my extra ram the problem was solved! I then decided to put the ram back in and test it and it was still solved! So I think unpluging the power and taking the battery out resets something. Try your old stick of ram - it might still work...

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