I'm posting in this forum because, though I'm a long time Mac user, I'm relatively new to OS X. It's entirely possible that my problem is merely due to a software/preferences/settings issue I may be overlooking or unfamiliar with. I recently purchased a G4 (MDD FW800, 1.42 GHz DP, Running OS 10.4.11) off Ebay that may or may not have a bad CD/DVD drive (PIONEER DVD-RW DVR-105, Revision: A506). The seller, of course, claims the drive was fine. What I've tried thus far: F12 does open and close the tray I've tried CDs and DVDs, music and data CDs, blank CDs, disks I've burned as well as commercially produced CDs and DVDs. None automatically mount on the desktop. None appear in any finder window I've tried several (commercially produced) DVDs but DVD player only reports "Supported Disk Not available" Finder preferences --> general --> "Show these items on the Desktop: CDs,DVDs and Ipods" IS ticked System profiler sees the drive on ATA bus Disk Utility does not see it (loaded or not) I have used Disk Utility to repair permissions on startup drive (obviously not from the CD as suggested) I have reset p-ram I tried it connected to the ATA-66: again, no change. Still seen in System profiler, still doesn't mount and surprisingly, F12 still opens/closes tray! I've read about jumper issues, specifically, with Pioneer superdrives. It was jumpered as CABLE SELECT, I moved it to MASTER: no change My questions: Is there any other preference setting, etc. I've overlooked? I've read there were definite problems with Pioneer superdrives and 10.2.4. (http://www.xlr8yourmac.com/archives/feb03/021403.html) but I haven't yet found a similar situation with 10.4. Anyone else? The seller claims, "The Pioneer A05, installed in the computer, was fully functional when it was here in our integration room. When I wiped the hard drive clean, with the OS disc that we have in house, the disc appeared on the desk top- with no problems.". Is it possible there is some "driver" or the equivalent that may have been in the previous OS but not the recently loaded (10.2.4.)? In previous Mac systems, if a prefs file somehow got corrupted, you dragged it to the trash, emptied the trash, restarted and (usually) all was well. Is there an OS X equivalent? Is there any diagnostics/utility either bundled with OS X or available as freeware/shareware I could use to test the drive? Might it respond to a firmware upgrade? (yes, I realize this can only be done from a PC) More and more, I'm beginning to think I have a dead drive but (though I shouldn't have to do so) if I'm forced to purchase a new one, how can I confirm with certainty that this drive is, in fact, beyond repair and definitely dead? I have a few working G3 iMac CD/DVD drives. Would they work in this as a temporary read only replacement? What else might I try? Any and all comments, suggestions, etc are welcome! Thanks in advance for any help. Answers to any of these questions is appreciated. Thanks!