Just connected Apple TV and all I have is a green screen.

I just connected Apple TV, and the screen is green.  The remote doesn't seem to be working either. The light flashes when I press buttons, but that's it.

Can you clarify things - Snow Leopard is not downloadable, OS X 10.7 Lion is - from the Mac App Store.
Your profile says you are running 10.6.3 - that is Snow Leopard, although it's been updated to 10.6.8 now.
If you've got a disk stuck in the drive try restarting and holding the mouse down - hopefully it'll spit it out. You'll probably need to do hard shutdown and restart using the button on the back.

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