boot up with -s and remove the video kexts that you installed from the DVD. reinstall them once you have a system that is running. The default graphics will work until then.

OR...

Erase and reinstall the OS only this time do everything BUT selecting the video options. Too many people expect a fully working system right after install. Hackintosh is about fiddling with your machine to get it to work instead of expecting it to.

worry about the video, audio, ethernet, etc. later. it can be fixed later. First get a working system from an initial install.

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