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Messages - lke

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We are switching from another digital signage system.  I have removed the proprietary box and replaced it with a Mac Mini running the MediaSignage player, and now I can't get the same display resolution as I used to have.  Here's the setup:  

Mac mini <--DV to VGA adapter-->  into a box with an HDMI and a VGA output.   HDMI cable running to TV #1 (a Samsung HDTV).   VGA cable splits out to two CAT5 lines that run up to about 100 feet - at the end of each is a Cat5 to VGA adapter, and VGA going into HDTVs #2 and #3.  So three TVs in total.
I used to send a 1280x720 sized display that looked fine on all three TVs.  Now if I set the screen resolution to 1280x720 I get a "not supported" message on TVs #2 and #3.  It works on TV#1 but the 1280x720 mediasignage screen file gets badly pixelated.  

The highest resolution I can get running on all three is 1024x768, but then I have to set the TVs in Standard mode so the images aren't stretched.  

So the question is how do I get a decent image - the highest resolution possible - on all three TVs?  I've tried Switchres but it doesn't seem to help.

Thanks in advance for any help!

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