On the desktop right click and choose Properties. Click the Settings tab and choose the proper display.
I plugged a Dell flat monitor to my laptop. I tried to open the monitor but I keep gettin the message Entering power save mode, press Pc button or any key... but it doesn't work. I had the same problem before, and I fixed it but I don't remember what I did.
I check in the control panel in Power options and all are *Never*.