My Acer 4280TG started acting up a few weeks ago. The screen was blanking toward the end of the boot process and a hard shutdown was required. I finally figured out that it was only happening when it was plugged in. It has yet to happen when the boot is done on battery. Sometimes when I plug it in after boot-up, it will continue to work other times it develops a 2-3 inch stripe on the right side (top to bottom) that is made up of small squares of various colors and then it goes blank.