Plug in USB or FireWire on Cinema Display and it turns off display power

Just recently, my monitor lost power.  After checking everything, and putting in a new video card, I have discovered that the monitor works, as long as I do not plug in the USB or ForeWire cables on the end of the monitor cord into the Mac Pro.  This is 20" Apple Cinema Display.  Plugging in either one turns off the power to the display.  Unplug them, and it is back on.

Very simular, although your cycle count is higher.
Health Information:
  Cycle Count:          337
  Condition:          Normal
Even though you are out of warrenty they may still have a look at this for you in the store as Apple are renowned for great aftercare .

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