freez in apple logo and kext for graphic #iATKOS #ML2

hi.



i install Mac OS Mountain Lion 10.8.3



Evrything Works fine Exept :



1.when system booting in logo apple freez 1 minuts (no tak action in hard) and after booting fine and hard working.



2.i can't find kext for my graphic ( ATI Radeon 5700 Series (Sapphire) )







Motherboard: Asus P6T ( Only P6T)



my hard is HDD not SSD







please help me.