I had the identical problem with a new Sony VAIO Laptop w/ Blu-Ray. I believe the issue you're having is related to the HDCP that Vista has added to protect HD content from being copied. Essentially, you can only have one display active when using the Blu-Ray drive. The key is to have your display set so that it's using a single display and that it's the TV. This sounds like a no-brainer if you're used to varying your display settings. While troubleshooting this issue, there were many times that I had the display set to only use the TV and it still didn't work. I suspect that once I tried to play and the content was blocked, there was no undoing it. So, before you hit PLAY, make sure the TV is your only active display. Try having both the TV and laptop off, hooking them up (HDMI cable) and then turning them both on. See if your laptop automatically sets the TV as the only display. If not, go into Control Panel>Personalization>Display Settings and make the TV the "Main Monitor". Alternately, you can select Advanced Settings button from within Display Settings and go to the NVIDIA Control Panel where there are more features for setting display preferences. I apologize for the less than specific instructions...as I said, I had to finagle the thing a bit.
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