Thunderbolt display do not turn on iMac 2011

Hi,
any idea why Thunderbolt display do not tur on iMac 27 (2011).
it turn on rarely (2 times from 10)
I also have conneced 24 Cinema display via display port

I believe AHT is a totally self-contained environment with its own (I assume very basic) video driver.  I originally suggested a safe boot because that simplifies video too by suppressing quartz extreme.  The ideas here were an attempt to minimize some of the video software involved.  But the intermittent nature of your problem I believe indicates a hardware problem.  And since it worked sometimes I'm inclined to believe it's the video card.  It's not definitive, only my "feeling".
I don't think there is any more you can do at this point other than let apple diagnose it.

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