May 08, 2013 · Being as I already own 6 other Iomega Zip drives (100 and 750 mb styles) I wanted to buy a couple more. I have 4 desktop computers running. The two non-functioning Zip Drives when plugged into the Power Supply adapter both show “green and yellow” monitor lights “ON” next to the front push eject button. Discuss: Iomega ZIP 100 USB-Powered - ZIP drive - USB Sign in to comment. Be respectful, keep it civil and stay on topic. We delete comments that violate our policy, which we encourage you to read ...