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MBA won't work with VGA projector

4291 Views 5 Replies Latest reply: Oct 19, 2011 12:55 PM by tinoberlin RSS
Sobeck Calculating status...
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Feb 28, 2011 6:24 AM
i have the adapter for VGA displays, and it works just fine with a desktop VGA monitor, but i've tried it on two different projector systems at work with no success. when i attache the VGA cord from the projector to the adapter and plug it into the display port, the screen on the laptop flashes blue as it normally does when being attached to an external display, but it doesn't output video to the projector.

if i go into the displays control panel and ask it to detect displays it does nothing at all. after the first time, i figured the projector was bad, but i find it hard to believe that two randomly selected projectors are both bad. it has to be something i'm doing wrong. help.
MacBook Air, 27" iMac, Mac OS X (10.6.6)
  • dkat484 Calculating status...
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    Feb 28, 2011 8:40 AM (in response to Sobeck)
    You didn't mention if you had restarted the MBA after connecting to the projector. I've found that some projectors need that in order to show up on the Mac. I've connected my 11" MBA to 2 VGA projectors without a problem. In both cases, I shut down the MBA, connected the VGA cable, turned on the projector, and then fired up the MBA.

    Mac Pro 8-core, Mac OS X (10.6.2), iPhone 3GS 16GB, 3.1.2
  • mrobertsm Calculating status...
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    Mar 2, 2011 9:32 AM (in response to dkat484)
    Some older projectors need that sequence all the time. Somehow, if the laptop is already on and plugged into the projector, the projector doesn't detect the video in signal as it boots up. On the other hand, if you are following someone else who already used the projector, and unplugged their laptop but left the projector on, when you plug in your laptop (already on), that sequence may not be necessary. But when the signal doesn't seem to be working, turning everything off and starting with that sequence usually solves the problem. That and making sure the "mirror displays" function is on. I've also had that go off on me and then the projector sequence is the wrong solution.

    Message was edited by: mroberts8
    MBA, Mac OS X (10.6.6)
  • dkat484 Level 1 Level 1 (10 points)
    Currently Being Moderated
    Mar 2, 2011 1:13 PM (in response to Sobeck)
    Glad to help.
    Mac Pro 8-core, MBA 11", Mac OS X (10.6.6), iPhone 4
  • tinoberlin Calculating status...
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    Oct 19, 2011 12:55 PM (in response to Sobeck)

    Great, had the same problem last Monday in a lecture hall ... no signal. Today I restarted and it worked. I am not sure whether it was necessary to connect the cable before restarting. A restart, at least, helped but I am not sure that something else actually caused the problem. I have one of the MBP that having the display problem after Lion install ( and Restarting the WindowServer sometimes helps using the command "sudo killall -HUP WindowServer".


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