I had a good-running Powerbook G4 for several years until -- seemingly out of nowhere -- it started rejecting all new, blank CDs (DVDs as well). It still reads disks with data on them, but after a couple of seconds, ejects blank ones. I'm running OS 10.3.9 and do all the software updating. I've tried re-starting, while holding the option key down, and some other things I picked up on the Internet, but to no avail. Anybody encounter this and know how to fix it? Thanks!