1. BIOS SETTINGS
You will need to set your BIOS to ACHI mode and your Boot Priority to boot from CD-ROM first. This is the most important step, and one many people overlook. Make sure your bios settings match these. It's not difficult- the only thing I did on my Gigabyte board besides setting Boot Priority to CD/DVD first was set Optimized Defaults, change SATA to AHCI mode, and set HPET to 64-bit mode.
2. INSTALL MAC OS X
In order to boot the Mac OS X Retail DVD, you'll need to download and burn iBoot. For desktops and laptops using unsupported Intel CPUs and graphics, a legacy version of iBoot can be downloaded here. If you have an Ivy Bridge or Haswell system, you can’t use the default iBoot. Use iBoot Ivy Bridge or iBoot Haswell.
Download iBoot
Burn the image to CD
Place iBoot in CD/DVD drive
Restart computer
At boot prompt, eject iBoot
Insert your Mac OS X Snow Leopard Retail DVD and press F5
When you see the screen below, press enter to begin the boot process
When you get to the installation screen, open Utilities/Disk Utility. NOTE: If you cannot get to the installation screen, retry from Step 4, type PCIRootUID=1 before hitting enter. If that doesn't work then try PCIRootUID=1 -x or just -x which will enter Mac OS X Safe Mode and will allow you to proceed. For some graphics cards, use GraphicsEnabler=No boot flag to proceed.
Partition your hard drive to GUID Partition Table
Format your hard drive to Mac OS Extended (Journaled). NOTE: The bootloader can only boot from a disk or partition of 1 TB or less. Partition larger drives.
For the purposes of this guide, name it Snow Leopard. You can rename it later.
Close Disk Utility
When the installer asks you where to install, choose Snow Leopard
Choose Customize‚ and uncheck additional options. This will hasten the install process. You can always install this stuff later.
Restart computer.
Place iBoot back in drive.
When you get to the boot selection screen, choose your new Snow Leopard installation.
View the super-cool Mac OS X Snow Leopard Welcome Video, and set up your computer!
3. UPDATE TO 10.6.8
If you have a Sandy Bridge system, please follow these specialized instructions to update to 10.6.8.
Open Finder and navigate to your Snow Leopard drive.
Download the Mac OS X 10.6.8 Combo Update
Download MultiBeast
Open MultiBeast- don't run it yet, just leave it open. Set up windows as shown.
Mount MacOSXUpdCombo10.6.8.dmg
Install MacOSXUpdCombo10.6.8.pkg
Upon completion, the installer will ask you to reboot. DO NOT REBOOT.
Switch to the already open MultiBeast. If it closes, just re-open it.
4. MULTIBEAST
MultiBeast is an all-in-one post-installation tool designed to enable boot from hard drive, and install support for Audio, Network, and Graphics. It contains two different complete post-installation solutions: EasyBeast and UserDSDT. In addition it includes System Utilities to rebuild caches and repair permissions and a collection of drivers, boot loaders, boot time config files and handy software.
UserDSDT is a bare-minimum solution for those who have their own pre-edited DSDT. Place your DSDT.aml on the desktop before install. Audio, Graphics and Network will have to be enabled separately. HINT: Check the DSDT Database for a pre-edited DSDT.
Run MultiBeast.
If you have a custom DSDT that's been edited, place the file on your desktop and choose UserDSDT.
All others select EasyBeast
Select System Utilities.
Optionally, you may install further drivers via Advanced Options to enable ethernet, sound, graphics, etc... Be sure to read the documentation provided about each installation option. NOTE: EasyBeast, and UserDSDT install the bootloader by default, so you'll not need to check that option.
MultiBeast Demo Videos
Install to Snow Leopard- it should take about 4 minutes to run scripts.
Eject iBoot.
Reboot- from your new Snow Leopard installation drive.
If your drive doesn't boot on its own, and you get an error referencing boot0, fix it using the methods listed here.