I have an Acer Aspire 7741z-4433 laptop. I recently re-installed Windows 7 and something odd has started happening. Whenever a program like a game makes the resolution change the screen goes black, I imagine to attempt to change, but it dosen't come back. It happens also on start-up, after the screen flickers it goes black. Finally it happens when one of those security warnings pops up, its not a common but it has happened before. If I close the screen, making the computer fall asleep, then turn it back on, the screen comes back on. This is very annoying when your playing games, please help.