I have a 22" Cinema display that gets used with several computers for testing/diagnostic purposes, as well as when I want to play around with my upgrade Quicksilver or one of my Cubes. The USB ports normally work fine. I always keep the keyboard and mouse connected to it(black Pro keyboard and black Pro mouse connected to the KB), and have also on many occasions have connected to the Cube speakers to the other USB port. The Cube currently has a Radeon 7500, although I had the same problem when I had a 2MX installed. The issue happens specifically with the Cube when I have the KB plugged in one port, and plug a USB thumb drive into the other port. At this point, both USB ports on the display will die. Removing the thumb drive won't restore them-I have to reboot to get them back. Rebooting with the thumb drive inserted results in dead USB ports also. It happens with every thumb drive I've tried. Some(but not all) drives will work plugged directly into the keyboard-I don't have this issue when plugging drives directly into the keyboard. The issue does not happen when I have the display plugged into any other computer(including with the same thumb drive), nor does it happen with the Cube plugged into a different ADC display. Admittedly I've only tried it with one Cube(I have two others I could try, but they are at different physical locations). Does anyone have any thoughts on what could be causing this very specific problem?