hi, i have been trying for about a week to get this working, i install OSX on my HP Pavillion Notebook but when i boot up OSX it goes to the apple logo and the pinwheel but after that screen disappers its just black, what do i do!!

Specs...
HP Pavilion dv9700 Notebook CTO
Windows 7 Ultimate 64-bit
Intel Core 2 Duo 2.10 GHz
Nvidia Geforce 8600M GS
BIOS: Ver 1.00ARTTBL
4GB Of RAM

I would greatly appresiate help
if you nned anythng else just let me know