Win7 won't install, black screen - boot camp

Hey, I have burned a win7 .iso file to a dvd and was going to install windows with boot camp. After the partition was done my iMac (24-inch, Early 2008) restarted and the screen went black with a white line blinking in the upper left corner.
Does any one know why it won't start the installation?

so i tried lukeD's solution again and a message came up, M76XT B22504 MXM GDDR3 256M 680e/750m
I googled it and found this thread and changed the resolution to 800x600, once it started up everything went back to the flashing cursor... , https://discussions.apple.com/thread/2617388?start=0&tstart=0
I could really need some help!

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    SamMill wrote:
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    Message was edited by: nerowolfe

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