No video signal on projector (Lion, MacBook Pro)

Hi guys
since I've update to Lion (10.7.2),  I have problems getting a video signal via mini-DVI / VGA to certain projectors. I'm using a Mac Book Pro (end of 2008). I have never encountered similar problem with previous versions of Mac OS X. Restarting the MacBook or the projector doesn't help. Does anybody have an idea what to do?
Thanx
fweth

I also update to Lion from 10.6.8.. My Dell 3300MP projector worked fine with Snow Leopard. Then with Lion, there is occassionally scrambled signal, but most of the time no signal.. Tried restarting projector, restarting computer, turning mirroring off and then on, but no help. I am running an early 2011 13" MBP.. Really frustrating for someone who does lots of presentations and teaching.

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