LED Cinema Display 27 Random Loss of USB

I have a brand new 27" LED Cinema display connected via Mini Display Port to my 2006 Mac Pro with an ATI Radeon HD 5770 graphics card.  The display's USB cable is connected to a USB port on the back of the Mac Pro.  My keyboard is the newest Apple extended keyboard (wired) that is plugged into the back of the monitor.
The problem is that randomly (about one out every 8 boots but with no pattern or rhyme-or-reason), I have no USB connectivity from the keyboard.  I am unable to enter my user name and password to log in.  While it is in this state I have pulled the monitor's USB cable from the back of the Mac Pro, waited 15 seconds or so and then plugged it back in.  This does not fix the problem.  The only solution so far is to force shut down the computer using the power button on the front of the Mac Pro, then disconnect the monitor's power cable, plug the monitor's power cable back in and re-boot.  So far 100% success with this process.  Somehow removing power from the monitor resets its USB bus.  I just don't think I should have to do this once or twice a week... or more.
So I have a solution but it is a pain in the rear and involves crawling under my desk.  I could try plugging the keyboard directly into the Mac Pro and abandon all use of the USB ports on the back of the monitor but would hate to give up functionality that I paid for.
This only occurs on boot... I have never lost USB connectivity while the computer is running if it boots and works properly... even after sleep.
Any thoughts or help would be appreciated.

I installed Mountain Lion last night. Playing around a bit before going to bed I noticed that my keyboard seemed to fade in and out, sometimes what I typed showed up, sometimes not. This morning I was using Messages, tried the camera. First I got a warning saying no camera was attached to Mac (built in iSight?!?!?!). The unplug/plug method didn't address this. Restarted Mac Pro, camera showed up but there was major lag, like it was someone's video sent to me from a bad connection not locally streaming video! Also, graphical anomalies kept popping up in the video. (a note: none of this was happening with my MBP with FaceTime camera after ML install)
And then it hit me.
Due to the short span of the mini display cable on the LED Display, I have to use an extension cord for the MiniDisplay and USB. Removing the MiniDisplay extension cured my video issues. I removed the USB extension and put in place another USB hub testing my previous post. So far, with keyboard and Wacom plugged into the Displays USB, no issues. It's early though so who knows. I wouldn't mind trying a straight connection to a Mac Pro USB but Apple has made the cable far too short and working with my head next to the tower just isn't desired.

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