Thunderbolt to HDMI external display: no signal

I have a mac air 11" late 2011 and can't mirror display with a thunderbolt to hdmi cable. I tried on my sony bravia KDL46EX705. The display is detected, it shows SONY TV, but no image on the tv  I've tried resolutions, Hz, and a couple of other stuff at the tv that did no work out. all softs and firms are uptaded. Tried also on a Phillips 42" and the same. I've bought both mac and cable at the 5th av apple store.  

Hi,
I have found a related issue - after sleep it appears to go back to its "default" of the (speaker-less) Dell display connected via DP.
OS X Seems to understand there is no sound output (controls are greyed out), but still keeps using this as default. Never had this issue under Mavericks.
Any thoughts?

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