On old MacBooks with the mini-DVI video output ports (currently used by teachers at the Junior High, Senior High and PSI, as well as some principals and TOSA's) the screen can become garbled at certain times while using the Projector. What causes this is that the a program wants to use "full screen mode". These Macbooks apparently can't support that, and the screen on the MacBook becomes garbled, while the projector continues to project correctly.
The programs that often will cause this include:
Powerpoint (slideshow)
Screensaver
SmartBoard Notebook (fullscreen)
You can continue using these programs without an issue, or you could try these fixes. None of these will permanently fix the problem, however.
1. Unplug the projector from your computer, allow the screen to reset, then plug the projector back in. Sometimes this works, sometimes not.
2. Quit out of the program. Restart the program, and do not use the settings that cause the screen to become garbled.
3. Go into Apple(in the upper lefthand corner of the screen)-->system preferences-->desktop and screensaver-->screensaver and slide the toggle under "start screen saver" to "never". This will prevent the screensaver from causing the problem.
Hope this helps!
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