Cannot display through a projector

we have 2 macbook pros. My old one connects to external displays and projectors without any problem. My wife's new one however will connect to displays but not projectors. Obviously as I can get my laptop to do it I guess I know what I'm doing ..... so is there a fault on the new one or is there a trick I am missing?

Lukewarm13 I think you should start your own post with that question! personally I think you have a faulty unit.
Did some more testing. My wifes laptop will connect to the projector when using a different (short) vga lead and works fine. Then I can switch to the long cable and it still works fine! BUT if I restart the computer it again fails to work with the long cable until I have used the short lead first. weird!!!!
My laptop works fine first time with either cable!

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