VGA Card problem #iATKOS

Hi!



I'm trying to intall mac os 10.6.8 on my pc with configuraion:



-Mortherboard: Asus P5kpl-vm



-CPU dual core E2140



-VGA Gigabyte ATI Radeon 4650 1gb



-Screen : 1440x900



...



My problem is:







After system was installed(with no vga card plugged in).It can boot with no problem if I removed VGA card but it cannot recognize the resolution of screen.



And when VGA card is plugged in the system cannot boot.It only show the Apple icon and waiting for so long and nothing else happen.



How to fix this problem?



Thanks so much for any ideas!