My macbook shows a second display in System Preferences->Display. There is no second display attached. I have clicked "Detect Displays" and rebooted, with no change. The annoying part, is that my mouse keeps going to the "other" display. I would use "Mirror" to eliminate the symptoms, but the available resolutions are low and not wide-screen. To get around it for now I just dragged the "other" display to the bottom corner of my macbook's display, so that my mouse doesn't wander over there. Do any of you have any thoughts about something I could try? Thanks, Josh
Try resetting the SMC. Apple website will show you how. My Mac once got its knickers in a twist, it didn't know which was the internal and which the external monitor. SMC reset fixed it. It sounds like you might have a similar problem.
maybe if you reconnect to the external display (I assume there is one) and disconnect, it'll reset? here's a thread on the apple forums... seems you're not the only one to experience the issue http://discussions.apple.com/thread.jspa?threadID=1429959&tstart=0