Mini DIsplay Port on MBP (MacBookPro6,2) does not seem to work

The Mini DIsplay Port on our office's new MBP (MacBookPro6,2) does not work with the office Toshiba projector, (several years old - 800x600 VGA) that I use for presentations. We have used a variety of MBPs with this projector over the years, they have always worked fine.
With the new MBP, we are using a new Apple (not 3rd party) Mini Display Port (MDP) to VGA Adaptor. When connected, projector says "No Signal".
The workaround is to copy the presentation to my personal MacBook Air 11" (MBA) and connect the projector using the same adapter. Just disconnect the MDP adaptor from MBP and connect to the MBA. This seems very strange behavior for a two week old MBP. Is this a known problem with the MBPs? Thanks.

OK, I think I figured this one out. I have a utility installed called "gfxCardStatus v.1.8.1". This enables you to manually switch the active graphics cards between "Intel Only", "NVIDIA Only" or to allow the MBP to "Dynamically" switch the card. I had the card set manually to "Intel Only". On this setting, the projector did not sense a signal. Upon switching to "NVIDIA Only" the projector sensed a signal and worked just fine. I did not test the "Dynamic Switching".
Message was edited by: Mac MD

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