Hi, I have a 1.5 year old 23" Cinema HD display connected to a mac pro with 10.4.11 (all latest updates installed). Over the past 2 days, upon awaking from sleep, my keyboard/pen tablet would not work. Initially I solved the problem by unplugging the display's USB (which the keyboard was plugged into.. pen tablet was plugged into keyboard) from the back of the Mac Pro and plugging it back in again. However it continued to happen, so I was hoping a restart might help things. I restarted and after doing so, even unplugging the USB from the back of the Mac Pro would no longer make it work again. I now have the keyboard working again by having a USB hub acting as an extension cord plugged directly into the Mac Pro. That is not ideal, however, as it is an older USB 1 hub and my pen tablet's mouse was then now jerky (settings haven't changed and was smooth plugged into the keyboard), so I had to plug the pen tablet directly into the Mac Pro, losing another USB port, and ultimately, of course, I'd like all my equipment to be within working order and have those USB and Firewire ports on the display back. Does anyone have any troubleshooting suggestions? The display seems to be working just fine otherwise *crosses fingers* Is there any way to fix this?