Hello--I have the same problem that many others have asked about: I can't change the screen resolution. I have Windows 7, and I was able to play certain games when I first got the computer. However, I can't play many of those same games now, and when I download new games I can't play some of them and get the message that the game can't be played on the current screen resolution. My guess is that one of the Windows 7 updates caused this problem.
P.S. I have tried some of the solutions that have been published here; e.g., shut off monitor and computer, unplug monitor, reboot computer; update drivers.
P.S. I have tried some of the solutions that have been published here; e.g., shut off monitor and computer, unplug monitor, reboot computer; update drivers.