My macbook air won't detect display when trying to hook up with mini port and hdmi cable

The screen turns blue and all it just won't show arrangments and then mirro display.. help!

Try it, a complete power off/on!
MacBook Air using Sony TV as monitor via Thunderbolt and HDMI.
I could not get my 32inch Sony Bravia to "see" my 2102 MBAir using the Thunderbolt-to-HDMI adapter and a known good HDMI cable.
So I took my MBAir to my local Apple Store,Encinitas California, along with the TBolt Adapter and a known good HDMI cable.
The salesman tried the same connection from my Air to their 40inch Sony Bravia using my cables.  It worked perfectly. The Apple salesman advised  I return home and make the same connections to my 32" Sony, turning it off and back on.  I realized I had already done that test several times.  Then, it occurred to me that _Sony "off "using the Sony Remote Control is not the same as _Sony off completely. So I returned home and disconnected the AC power from the 32" for over 30 seconds then turned it back on with the Air &Sony connected via the Thunderbolt-to-HDMI connection and  with the MBA turned on. The image came right up on screen and is still working.  So, is this yet another case of " when in doubt re-boot" ?

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