I've got a 2010 13" Macbook Pro with 4GB of RAM, 2.4GHz Intel Core 2 Duo Processor and im trying to connect it via HDMI to an external monitor. The problem Im having is that under the Display tab in System Preferences, the Underscan/Overscan bar is grayed-out and I can't adjust it at all. I need to do so in order to properly fit my desktop onto the 32" HDTV. I have tried all resolution options and that doesn't seem to be the issue. I just need to adjust the slider and everything would be fine.