Currently Being ModeratedNov 9, 2012 4:14 AM (in response to Sarah.Evans2013)
You've done all the relevent troubleshooting (reinstalling the OS probably was over the top though). I suspect the cable. Do you have a friend who was a computer with the MiniDisplay Port or are you close to an Apple store? If you can check the cable before going to the expense of getting a new one that would be good.