I have a G3/300 Yosemite. Recently, I stopped getting a Zip Disk icon when I placed a Zip Disk in my Zip Drive. Then I noticed that whenever I used my VST Flopy Drive, no matter what disk I inserted, I would be told that the disk was unreadable and all attempts to initialize these disks failed. Finally, my Brother HL-1240 Laser printer gets a consistent -23 error asking me to "check printer." Things to consider. I was running MacOS 8.5 up until a few weeks ago. I upgraded to 9 ... 9.1 and 9.2 so that I could test a trial of Illustrator 10. This may not be the problem, however. I have also been carting my machine back and forth to my office weekly. Please help. This is creating huge problems for me.