I normally use an additional Samsung monitor with my MBP (DVI -> DVI) with no problems. The computer always detects the external monitor and designates it as the 2nd screen. However, I tried hooking my MBP up to my LG television with a DVI-HDMI cable. When I have it plugged in, and navigate to the correct input on my TV, nothing shows up on the TV. The screen on my laptop temporarily blanks out and resets - as it does whenever I connect my Samsung monitor - except when it resets, nothing has changed, and nothing displays on the TV. I tried to "Detect displays" and tweak anything else that I could under Preferences > Displays, but I'm at my wits end... Does anybody know why it might not be showing up?? Thanks!