HT3235 MacBook Air is connected to an external monitor via Apple Mini DisplayPort to VGA Adapter. At one time it worked just fine, now when I plug the monitor into the Mac, the mac screen goes blue and nothing appears on the monitor.

This monitor works, on a PC. Could the connector be bad or the port on the Mac Air? Any ideas?

You have the display set in Extended Desktop mode with the MacBook as the main screen. In System Preferences>Display on the MacBook screen there should be an Arrangement tab when you have the MacBook hooked up to the TV and both screens working. When you click the Arrangement tab do you see two monitors side by side? One of them will have a Menu Bar at the top. Just click on the Menu Bar and drag it to the second monitor. That will make the second monitor your main screen.
You can now use your MacBook in Clamshell Mode with a wired or Bluetooth keyboard and mouse. http://support.apple.com/kb/HT3131 When you disconnect from the TV your Menu Bar will automatically change back to the MacBook.
Or if you want to use the MacBook’s keyboard and trackpad to work on the MacBook screen while showing it on a TV you can check the Mirror Display box on the lower left hand side of the Arrangement tab under the two monitors box.
If you can’t see your MacBook screen because it’s broken or the backlight is off use the F7 key to switch between Extended Desktop and Mirror Display.
(From the MacBook User Guide: F7 (video mode toggle key) Switch between dual-display mode (extending the desktop across the built-in display and an external display) and video-mirroring mode (presenting the same information on both displays).

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Macbook air Mini DisplayPort to VGA Adapter connectivity issues

Hi pple,
Would like to ask if anyone is facing connectivity issues with Mini DisplayPort to VGA?
I am currently using the 2nd Gen Macbook Air with Intel HD Graphics 3000 384 MB. Sometimes when I connect to a montior (Viewsonic VA1918wm) it works fine, sometimes it just does not work and the laptop just shows me a blue screen.
I tried with out with my friend's Mini DisplayPort to VGA adapter, it has the same problem. Does this means that my macbook air mini disoaly port got a problem?
Thanks
Bryan

I am experiencing the same kind of problem... only with projectors. Some projectors will display the screen and then others wont even register with the MacBook Air.
Using an Apple Min Displayport to VGA adapter. It's hit or miss if it works. Firmware has been updated on the adapter but this did not help.
Anyone help with this?
Thanks,
Nathan.

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Reset PRAM. http://support.apple.com/kb/PH4405
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Thanks for using Apple Support Communities.
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HT3235 MacBook Air is connected to an external monitor via Apple Mini DisplayPort to VGA Adapter. At one time it worked just fine, now when I plug the monitor into the Mac, the mac screen goes blue and nothing appears on the monitor.

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