icon for zip drive no longer appears on desktop. How do I get it back?

I use 100 MB zip drive for backup on my Emac -OS 10.4.11. It works fine for years. Zip drive started clicking a lot lately when used but would then setlle down. I decided to disconnect it from power and USB port to give it a fresh start. When reconnected it doesnt mount. It does not appear in Disk Utility-it does appear in System Profiler. Ordinary CDs load properly except an eMac OS X install disc 1 also doesn't load. What can I do get my zip drive back on the desktop?

I note also that eject button on Zip doesnt work (I use a paper clip). Alsdo --although icon doesnt appear occasionaly lights on Zip flash briefly as I use the computer -