COMPUTER SCREEN DISPLAY FREQUENTLY GOES VERY DIM AND SOMETIMES COMPLETELY OUT SEVERAL TIMES THERE HAS BEEN NO DISPLAY SHOWING WHEN WE WERE BACKING UP PLUS THE WARNING BEEPER DIDN'T COME ON. WE HAVE HAD 2 MINOR ACCIDENTS WHEN WE WERE BACKING UP BECAUSE OF THE FAILURE OF THE COMPUTER SCREEN AND WARNING BEEPER. I HAVE COMPLAINED TO OUR DEALERSHIP HOLM AUTOMOTIVE IN ABILENE , KS FOR AT LEAST 2 YEARS AND THEY DO NOT SEEM TO THINK IT IS A PROBLEM. I HAVE MANY PHOTOS AND VIDEOS PLUS A HANDWRITTEN LOG OF THIS ISSUE. I HAVE ALSO BEEN IN CONTACT WITH BUICK.