pinke_v,

Did you reset or do any kind of firmware update on the TV since the MacBook was able to connect? You might edit the name of the input to DVI or DVI-PC as outlined on Pg. 12 of the manual.

MENU > INPUT > EDIT NAME > DVI or DVI PC > [Enter]

You'll also want to make sure that your computer is sending a resolution that is supported by the TV. (1920x1080 @ 60Hz) Also, if applicable, check to make sure that your overscan settings in the video card are set to 0.

Does that help?

--HDTech