MBP 13'' Display and Screen Problems.

HELP!
I've posted about this problem before, and I've read all the threads, but my problem is not resolved despite sending my new MBP back to Apple to sort it out. They fitted a new logic board, but it has made no difference. My machine is still under warranty.
The MBP continues to totally freeze when connected to an external projector via the mini port using VGA. The computer screen goes a funny blue-ish color with everything out of focus and the pointer freezes, too. It has also started to make a funny buzzing noise, too. I have to restart the entire machine, which is not very convenient right in the middle of using it. It is an intermittent problem. Sometimes, the machine is working OK for a few days, other days it crashes several times.
I have read that this may be something to do with 32 bit versus 64 bit Kernel start up. Some suggest resetting the PRAM and system manager, but I'm still struggling. Does anyone know what the real issue is? A solution would be great.
By the way, I am resorting to using my old MBP (Nov 2006 15" model) and it works perfectly still, no matter what projector it is connected to. It is frustrating the **** out of me as I bought the 13'' to have more power and RAM and it is easier to lug about the place, but I can't use it as I need to connect it up to various projectors at work.
Any expert out there? I'd really appreciate a solution to this problem. Is it only confined to the MBP 13", or has the 15" got similar problems? From the threads, I can tell this has been a big issue for people using their computers in conjunction with a projector.

Badlydrawnboy wrote:
I have a new MBP that is less than 3 months old.  I've been having various display and power problems pretty much since I got it.
You should not be having those type of problems on a brand new Mac.  Did you call AppleCare about this?  If not why not?  
You have 90 days of free phone tech support from Apple on top of your one year warranty.  Strongly suggest that you use it before you lose it!  You already missed your 14 day from the date of purchase to return your MBP for a refund or an exchange.

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