Hey guys... i got a problem

I managed to install ideneb v1.4 (Leopard 10.5.6) on this hardware:

CPU: AMD Athlon 64 X2 (Dual Core) 3600+ 2GHz
Mainboard: Abit KN9-SLi (NVIDIA nForce 570)
RAM: 8GB 667MHz
Display card: Geforce 7300GS 256mb
Samsung Super Writemaster DVDR-Drive (IDE)
HD: Master disk 200GB (IDE) / Slave 700GB (SATA)

OS X was running great until i tried to change the display resolution... THE F'ing SCREEN WENT ALL BLUE???!! and i cant change back to the resolution i had???

Now everytime i boot or reinstall i get stuck at this BLUE SCREEN after OS X loads up??

when i start up Vista the screen works as it should.

Is it anything i can do to get this fixed?

Please help me out :/