When I originally hooked my new Macbook Pro up to my Samsung LED, the image was copped (could not see Menu at top). I then found the Underscan slider, adjusted it down and everything was fine. A week later I did an OS X update and all of a sudden the picture was cropped again, but this time the Underscan function was grayed out. Apple Support indicated they had never heard of this and advised me to return it to Best Buy since I was within the 14 day return period. Best Buy exchanged it with no problems (good for them. I brought the new one home, hooked it up just as before and everything was fine. I was paranoid , however, about doing an OS X update. Now 5 weeks later I decided I was being too paranoid so I finally did the update. Much to my horror the same problem occurred- can't see Menu at top and Underscan is Grayed out. I called Apple Support and their first statement was the Mac was not compatible with Samsung TVs. I told them there were two problems with that argument- 1)both Macs were fully compatible until I did the update, and 2) I also have a Panasonic 1080p HDTV and the same problem existed- Underscan function grayed out. I advised the tech it seemed pretty obvious to me that the problem was caused by the update. She finally agreed and passed me to a senior tech who took all of the information (types of cables; TV model numbers,manufacturer of Mini DVI to HDMI Adapter that I bought from Amazon,etc). He agreed that it sounded like a software update problem that needs to be researched. He promised to get back to me within the week.
Has anyone else encountered this, i.e., the Underscan slider worked until an update? FYI- the good news is I found that I could solve the problem by adjusting the TV itself from 16:9 to Screen Fit (hope this works for others). Nevertheless, as I told the Apple Tech (and he agreed) I don't like the idea that a function that is supposed to work is suddenly disabled for no good reason.