I upgraded to Mountain Lion 2 days ago my screen got black and when i try recover at web, appears the globe counting seconds but not fixes. What's up?!?

Its the question:
Why my display got black whenIts the os starts And works when i try to recover at web?!?
Appears No Signal. How!?!

Hi BdAqua!
I did that. Appears the logo( not perfect) but did not  complete the process.
I can't get that screen with theese options.
I turn on the Mac, press the keys ( cmd+r. Or cmd+q). But the display gets black screen beire complete the process.
Both ( recovery by web And repair the disk)
I tried turn on the Mac with the display disconnected ( thunderbolt connector) And afetar 30 séc passei, connect the Pluginswww, but it did not work tôo
I Thing its about incompatibillity  between montain lion And thunderbolt
Tanx for you help!!!

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