Yosemite clamshell mode on MBA

Hello,
Since I upgraded my MBA late 2010 to Yosemite, I cannot use the clamshell mode with my Apple Cinema display 24".
The BT keyboard and Trackpad are working fine but as soon as I close the lid the ACD turns off.
I did reset the PRAM, but no way.
It was working fine with Mavericks.
Thanks for your help.
Gilles

Sorry, but I found the solution myself, the magsafe power cable of the ACD to the MBA, was slightly pulled off and that MBA wasn't powered, thus making the ACD to be turned off when closing the Lid, now everything works fine again.
Hope this will help someone one day.
Have a nice day..

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    ajreynol 
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    Wolfpup 
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    SP Forsythe 
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