My macbook will not read mini to via but it will read mini to hdmi. I also have an identical macbook that will read both hdmi and vga. Cant figure out why the other one  won't read both

I have two indentical macbooks(unibody) but for some reason only one will read the mini to vga. the screen turns blue but nothing shows up. When i plug the other macbook up everything works fine. I work at a club and i need the vga to work at one club and the hdmi to work at the other. The second macbook(that i have to return to the club) plays both so im alot confused! lol thanks if you could help out. Im new to the Mac world and this is really confusing to me

http://www.apple.com/support/macbookpro-videoissues/

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