2nd Display not working (mini displayport - HDMI)

I have just upgraded to Snow leopard and I can't connect to my TV anymore.
It kinda worked the first time, but i did fullscreen on an internet tv show and it zoomed in, so I could only see a closeup of about 1/2 of the video.
I also was unable to access my dock (it was mirroring the main display)
i tried unplugging and replugging the hdmi cable and now my picture will flash up on the screen for about a second and then go blank. sometimes it blanks out the notebook screen too and there is no way to recover. I had to hold the power button to kill it. Sometimes when I connect the TV i can see the very bottom edge of the desktop on the top of the TV screen. With the rest of the TV blank.
Anyone else experience any weirdness with HDMI out?

You can attempt to use Apple Hardware Test, if you do run it in Extended Mode 2-3 times. It's not the most reliable test however if it does locate an error that confirms you have a hardware fault that needs to be fixed. The ONLY alternative is to take it in for service. However IMHO I'd take it in to an Apple Store or AASP anyway, because A) AHT is not that reliable and B) even if it does find something that means you have to take it in.

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