Benq MP771 projector does not detect my Macbook???

hello,
i recently purchased a benq mp771 short throw projector to use with my Macbook (2007). I had been told by the manufacturers that it is not compatible with macbook pros but works with macbooks. I was using osx 10.4 and had no problems using the projector. My hard drive crashed and after replacement it came with osx 10.5. I'm now running with 10.5.8. I have recently tried using the projector with my macbook but it seems unable to detect the laptop. My computer detects the projector no problem. I'm running a DVI to VGA input. It appears that the system upgrade may have made my computer undetectable. I wondered if anyone could offer any possible solutions other than downgrading the osx.
cheers
tone

How are the to computer connected?
Do y have any idea as to what the 157 kb is since yo say it can'g find the startup disk.
Does the MacBook Pro work OK?
Do you have File vault on?

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