Secondary monitor does not work after OS X install
My secondary monitor does not work well after OS X install. The image on my secondary monitor is different even the screen svaer image is different and the mouse can not be seen.
MacBook Pro
Try the easy thing first - NVRAM reset:
- Shut down your Mac.
- Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
- Turn on the computer.
- Press and hold the Command-Option-P-R keys before the gray screen appears.
- Hold the keys down until the computer restarts and you hear the startup sound for the second time.
- Release the keys.
If that does not work, post back with more info, including the version of Mac OS you are running. How is the external monitor connected, did it ever work, and from what OS X to what was the "OS X install" in your title?