Daisy-chained 27" Cinema display blinks when connected via Thunderbolt HD to MBA
I have a 27" Apple Cinema display with a Mini-DisplayPort plug that I am connecting as the last in the chain to a Thunderbolt external HD, which is then plugged into my mid-2012 MBA. The screen blinks on and off, about once per second, when it is connected in this manner. When I bypass the HD and plug the mini-displayport directly into the Thunderbolt port on the MBA, I do not have this problem. Yesterday, Apple support had me reset the SMC, unplug all non-Apple peripherals from the computer, and restart the MBA; this appeared to solve the problem. However, today the MBA is doing the same thing again, and resetting the SMC is not solving the problem.
MacBook Air, OS X Mountain Lion