Alternate display too dark

I use a 21.5" iMac running 10.6.3 to display videos for our meetings etc. I use keynote to arrange all the videos and then when presenting run it through a switcher to about 4 TV's of various sizes (we also have 3 cameras and a DVD player in the system). When I first got it, it worked perfectly. Now, after a software update, the alternate displays are VERY dark; you almost can't see anything. Because of what the switcher inputs accept I have to go from the DVI to VGA and then the VGA to a 5-BNC. Once again, everything was perfect until the software update. I know about the brightness settings in the System Preferences, that is all the way up. Also, if I just play a video in Quicktime or use the DVD player on the iMac it still shows up darker than it should be on the TVs. Any ideas?

Hi Eric
Welcome to Apple Discussions
Open the Display Preferences and in the panel for the connected Display(s), uncheck the box +(Show profiles for this display only)+ and try a different Color Profile.
Dennis

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    This produced the problem that type MNTR Monitor profiles have to do double duty, both as monitor profiles in which equal amounts of RGB do not produce gray and as working space profiles in which equal amounts of RGB do produce gray.
    So, this is why System Preferences > Display > Color shows both measured monitor profiles and monitor profiles for RGB working spaces such as sRGB, eciRGB, adobeRGB and so on and so forth. If you click a profile that is not your measured monitor profile, you reset the video system.
    Instead of resetting the video system, as you may be doing, install a good ICC profiling packing, calibrate your monitor, and characterise that state in a monitor profile that will be automatically installed by your ICC profiling package.
    Not all problems are configuration problems, some are bugs too, but if one has a sense of what the different dialogues do and how they are supposed to work together then problems produced by system misconfiguration can at least be eliminated in troubleshooting.
    /hh

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