Projector VGA not recognised after contact with 10.7

Hi I have 10.6.8 Macbook Pro which I use for teaching. Today I have been in several teaching spaces using a Picopix projector  attached to my Macbook with no problems.  After going to another college and attempting to use my Mini DisplayPort to VGA Adapter on a 10.7 system the projector display message 'no signal' was viewed the VGA adaptor no longer works and I cannot connect my Picopix to my system all I get is a 'no signal' message on screen I am desperate to get this resolved, please help.  Through a process of illimination this has to be connected to the Mini DisplayPort to VGA Adapter as this is the only element that has gone into both systems. What do I need to do to rectify this?

I was having the same problem: the iCal icon image would bounce once or a few times but never open. I re-downloaded and re-installed 10.7.4 as well and iCal works now for me, too. Not sure why, but that's what fixed it.

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