Updated Mac Mini to Lion OS, now lose display when it boots, unusable

I downloaded and installed Lion OS,  now when it boots, I get the gray screen with Apple log,   tiny wheel,   then about 1 minute later I lose the display with No Signal detected
I am using a BenQ monitor
Can anyone help?

Check this thread for possible solution.
https://discussions.apple.com/thread/3196192?tstart=0

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