first of all,,,,,,,,,,,,,DON'T PANIC! Did you try another hdmi cable? Maybe you should go over to the calibration section of the forum and ask over there - they have alot of very knowledgeable folks who have (in the course of calibrating other people's sets) been called on the "fix" and otherwise reset hdtvs that have been altered by an erroneous trip thru the service menus.
Try a message to Michael TLV. He is one of their best.
Best of luck.