Black screen

[Shaun Dimension 4700]

I installed mac os x86 successfully. I booted to find some text saying b0 error, i fixed this by setting the partition active. I then rebooted typed -v to boot, it loaded the drivers from wot i could see (lots of text on black screen). The problem was when it stopped it just has a black screen no os x booting?? After not long the black screen stops and restarts the computer?

Can anyone help?

thanks.