Did you try this?..http://www.insanelymac.com/forum/ind...howtopic=95097

or this?..http://mac.wareseeker.com/download/a....rar/e5d42a124

I am no expert, but I hunted for some time to get my ATI card to work and after some searching and experimentation I finally got mine working fully. I hope this helps.

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OS : Snow Leopard 10.6.8
Motherboard : Gigabyte GA-M68MT-S2
CPU : AMD Athlon II X4 645, 3.11 GHz
RAM : 4GB Crucial PC3/16000 DDR3
GPU : nVidia Geforce 210 1 Gig Full Hardware Acceleration
Sound : Onboard Audio Realtek ALC887
LAN: Sonnet Gigabit PCIe Ethernet Controller
Monitor : Acer S231HL 24" Wide Screen 1920 x 1080 @ 60 Htz
USB: Keyboard/Microsoft Confort Curve 2000 - Mouse/Logitech M185
Bluetooth: Apple Magic Tracpad/ DLink DBT 122 Bluetooth Dongle