Did you cut and paste the number (hex string) I gave you or did you edit it first? No spaces or returns.

The hex sting is for an nVidia 8800 GTS 512 MB ... it won't work for other Geforce cards.

Your boot.plist should contain ....

<key>device-properties</key>
<string>your hex string</string>

Use vanilla graphics kexts, no custom or injectors

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Gigabyte EX58-UD5 - i7 920 @ 3.2 GHx - eVGA 8800GT
Asus P5Q Deluxe - E8400 @ 3.6 GHz - Asus 7900GT
iMac 2.2 GHz - 4 MB