1 Reply Latest reply: Nov 22, 2012 8:47 AM by LousyFool
aleyon Level 1 (0 points)

Hey guys. Thanks for clicking through.


I'll keep this as simple as possible.



  • External monitor (Dell U2211H) connected to 2011 11" MacBook Air via Thunderbolt > Mini-DP to DVI adapter (from Apple) > Monitor.
  • Works fine.


After (I frequently disconnect/reconnect the cable to switch between Mac and PC)

  • MacBook monitor transitions briefly to blue (like it always does to resolve the new display arrangements).
  • Returns to desktop view, but no sign of external monitor being connected.
  • Monitor does not indicate at all that a source has been connected.


What I've Tried

  • SMC and PRAM reset.
  • Different cable.
  • Different monitor.
  • Restarting (obviously).
  • Disconnecting / reconnecting many, many times.
  • Restarting monitor.
  • Manually selecting DVI input from monitor.
  • Searching this and many other forums.
  • Using 'Detect Displays' in System Preferences.


This is an ostensibly random occurence. I simply plugged in the DVI cable and found that it would no longer register the display. Any help would be greatly appreciated.


Many thanks to those who have taken the time to read this post.


MacBook Air (11-INCH, MID 2011), OS X Mountain Lion (10.8.2)
  • LousyFool Level 4 (2,645 points)

    What you haven't tried yet, seemingly (unless I have misunderstood or overlooked something, or you forgot to list it):

    • Try a different MiniDP->DVI adapter.
    • Try a different Mac with TB or MiniDP.


    Because with all you tried it seems to leave the adapter or the MBA itself (or at least the TB jack) to be defect, or?