MacBook Pro not automatically recognizing external display

I have an ACER 2216W LCD display connected to MacBook Pro with DVI cable. When I first plugged the ACER display into MacBook Pro, the ACER started right up -- nice plug and play. I disconnected DVI to bring MacBook Pro to school, and when I reconnected it at home, I received a "NO SIGNAL" error message on the Acer. I sent the Acer to their tech support in Texas after receiving no support from Apple (in Canada) and it tested fine on their PC. (They do not support Mac). When I attach the display, or turn it on, MacBook Pro screen goes blue and comes back quickly, as if it is trying to id the display. When I push "Detect Displays," I get nothing. System Profiler is not showing an external display. Any ideas -- is there a start up command I can try? Thank you! My Photoshop homework is building up.

MacBook Pro forum:
http://discussions.apple.com/category.jspa?categoryID=190
Probably more people there would know the ins and outs of what you are trying to do.

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