No synchronisation between MacBook Pro 15" Retina and Apple LED Thunderbolt Cinema Display 27"

If I start my Retina MacBook with connected Apple 27" Monitor via Thunderbolt, I can notice less a second a blue Screen on both devices and then both Displays become black, since I installed Mountain Lion (10.8.2); the time before (Lion 10.7), the synchronisation was ok and everything is okay with my 13"-Apple AirBook (Lion 10.7) also.
Now, when this happens and I  move down the Display of my 15" MacBook Retina, I can see everthing on the 27" monitor. With an extern mouse, I can work quite well (without the MacBook-keyboard, because the Display is closed). I didn't try an extern keyboard till now. I only can move the pointer of the ext. mouse visible on both screens.
When I connect a further monitor via HDMI to my MacBook Retina, everthing is okay and I can watch 3 Displays !!!
When I turn off (the third still HDMI-connected Monitor), I can continue working with 2 Displays - Mac Book and 27"-Apple monitor, everthing is ok.
If I disconnect the 27" Monitor, I can continue on the MacBook without a problem. If I connect the Apple-Monitor via Thunderbolt again, the Problem comes again.
Why I can't  find a synchronisation between my 15" MacBook Retina (Mountain Lion 10.8.2) and my Apple 27" Monitor (baught in August 2012)????
Herbert

stevejobsfan0123 wrote:
... Some sites like eBay have a Buyer Protection Plan.
True, but eBay's policies are now totally lopsided in favor of buyers. So much, that there are far more sellers getting scammed these days.
Buyers hold all the cards with eBay.
Here's an ebay search. The lowest completed listing prices are within 10% of Apple's... about what you can get with an educational discount anyway. After listing / final value fees and Paypal fees, at those prices sellers are losing money.
Why? Hmm...

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