I recently upgraded to lion on my MBPro and was trying to connect my tv to the laptop with the mini display port to HDMI. It worked perfectly as i had mirrored displays when i had snow leopard and i changed the resolution to 1080i. I was fiddling around and unchecked mirror display. Now when i connect my laptop the Tv screen is black and my laptop only has the space background not even a dock or mouse cursor. I am really stuck and would appreciate help, thanks.