If you have just installed OSX86, you may find that when you reboot, OSX will just not load. You can usually edit the start up parameters from the boot screen, and select to boot with -x for safe mode, and -v for verbose mode. If your PC has an ATI graphics card, you may get the following error message:
ATI card non-POSTed, reading VBIOS from PCI ROM @0x0
To potentially resolve this issue, reboot again, and at the boot screen, edit the start up parameters, and type in the following:
Hopefully now MAC OSX will load, and you can look into permanently fixing this issue.