External display not supported when MacBook Air is closed?
I've explored this issue quite thoroughly before posting; any help would be heroic!
I have a brand new 11" MacBook Air running 10.8.4. I recently bought a used Acer external display (model AL 1916W A), and I'm connecting via Thunderbolt to VGA. The MacBook has been connected to a power source throughout these issues.
Everything was working normally when I first got the display. I adjusted some resolution settings to optimize the picture on the external display, and suddenly I was unable to use the external display when I closed the Air (clamshell mode).
When I close the lid, the Acer display reads "Input Not Supported." This is the same error message I got a few times when I was initially adjusting resolution - for example, if I went to a refresh rate higher than 75 hz, this message would display. However, in all of those cases, the screen would automatically revert back to a functional setting. Now, I close the lid and get nothing but the error message.
Things I have already tried:
- Reset external display settings to factory defaults
- Adjusted the resolution on external display with the Air open to various options, including 800x600 at 60hz
- Adjusted the resolution on built-in display to all possible options and tried closing the lid
- Reset PRAM
- Deleted "com.apple.windowserver.plist" file in Library
No matter what combination of display settings I use when the lid is open, it never works when the lid is closed. I'm assuming the Air is reverting to a high resolution / refresh rate to send to the external display when it closes, but I can't seem to adjust this.
Please help! 🙂
MacBook Air (11-inch Mid 2013), OS X Mountain Lion (10.8.4), 1.7 GHz Intel Core i7 with 8GB RAM