We've had two of our three 460s serviced because of that problem. They replaced the power board for the overheating and a small board for some discoloration problem in both lcds. The tech said it was mainly the power board for the error message. We luckily had them still under warranty. We are now experiencing the error on our third lcd, which unfortunately has passed the warranty period. You also might be able to make the error disappear by pressing the menu button on the monitor itself, but it'll come back if monitors are turned and off.