I have an Apple HD Cinema Display 23 inch connected to a Mac Pro with another 23 inch cinema display. They are both the older aluminum HD displays. One cinema display fails to turn on. No LED light indicator and no image at all. Not even if i shine a super bright light into it. ( I did this to check if the back light was the issue) I swapped the power bricks and same issue. The same cinema display fails to power up. The working cinema display works with either power brick. I tried different DVI ports and different machine. Same result. Computer Always detects second display but display does not work. Any ideas what is broken inside? Wondering if its worth getting repaired or not.