I am having a problem with my recently acquired 1400. I can't seem to mount any CDs whatsoever in OS 9.0.4. It doesn't matter if they're burned or if they're original from the manufacturer. These CDs work in other Macs, but not this one. I do know the drive itself works, because I can boot off of my Norton Utilities disk with no problems. It's leading me to believe that it's a software problem (extension maybe?) but I can't figure out what's wrong. Googling determined that I need the Apple CD/DVD extension loaded at boottime, but that's already there, so I don't think that's the problem.
If there are any souls more knowledgable on this topic than I, I would be very greatful for any and all suggestions you may have to remedy this problem.