Macbook not picking up External display?

I have just brought the new macbook air and i am trying to connect it to my Pioneer Tv via a HDMI. i have pluged it in to all the right places and something strange happens... when i turn on the TV the macbook does not pick it up at all, but then when i turn the TV off, the screen flashes blue and the display icon at the the top appars, here i can go in and look at it properties e.g. change the colour. but then when i turn on the TV the screen flashs blue again and it doesnt pick up these options or the screen. it just picks up the laptops screen.
is there away way to fix this? or to trasmit whats on the laptop screen to my TV?
thanks.

adamjn, system preferences>displays.

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MacBook Pro not automatically recognizing external display

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MacBook Pro forum:
http://discussions.apple.com/category.jspa?categoryID=190
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Macbook not picking up External display?

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