Using mini display to vga cable witch acer al707 17" display

i have bought a mini display to vga cable en put on my acer al 707 17" display on my imac 20"
but wen is start on mac osx the screen should start automaticly.
but is doesn't
wen is try it ons windows vista it cannot recenize the screen
what is the problem cannot figure it out.
my acer al707 says that the cable is connected to my imac but not showing anything only black screen
Message was edited by: second display doesnt start

Hye,
similar problem here. I have a Acer X223W that I want to use as an external monitor for my MBP15" 2.66Gzh running Snow Leopard (10.6.2) with a minidisplay to vga. The monitor doesn't get recognized ("no signal"). Any way how to solve this ? It was running fine on my previous ubuntu setup...

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