IMac 27 inch Core 2 Duo Black Screen while installing?

Hi,
I have to restart my computer when installing Windows 7 on my mac via Boot Camp because after the installation process and when I boot into windows 7 the screen just turns black but the computer is still on, can't hear anything but the computers hardware, is there anything I can do? Thanks ahead of time
From Pili

follow the link for a possible solution....
http://www.pcpro.co.uk/blogs/2009/10/26/how-to-install-windows-7-onto-the-new-27 in-imac/#ixzz0tinWW9tn

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