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Gigabyte GA-G31M-S2L and ATI 4850 help please

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I have recently replaced the motherboard on my computer and reinstalled OSX 10.6.8 onto a new hard drive using ###### and ######. all things work fine except one thing which is the graphics. it is an ATI radeon hd4850 and i ticked all the possible things in ###### to get this graphics card to work. the update worked fine and everything boots fine but when i go into system profiler it says it is ATI but doesnt display the model number and only displays a total of 3mb vram instead of the 512mb it is supposed to display. and also the resolution is stuck at 1024x768 and i cannot change it to anything else. this isnt a problem at the moment as im only using a 15 inch monitor that displays this resolution but when i put in a friends 22" DVI monitor it doesnt change.

can anybody help me with fixing this.

specs are Gigabyte GA-G31M-S2L motherboard

Ati radeon hd4850

Core2Duo e8400 3.0GHZ


can anybody help me please :)

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