I have a 21inch dell ultrasharp lcd, for about a year and a half now. It just today started acting strange. It will suddenly get extra bright and then shut off. The light remains green meaning that it is on. If I try to turn it back on, the image will come and then turn off again a second later. Usually after a few times the monitor will stay on. I tried unplugging and replugging it. The only other thing I can think of is I just got a new HP printer.