My Success Story with an existing OS X drive, Asus PQ5 and ATI 4670
So my Hackintosh success story is a bit odd but, hopefully this can help others in the future!
Here are the specs of my setup: Asus PQ5 Pro Motherboard without a modded BIOS (the EZ flash never saw my USB drive so I couldn't try), 4GB of DDR2 RAM, CPU is a 2.4GHz Intel Core2Quad (Q6600), Dual ATI Radeon 4670 512MB graphics cards (PCI-e, removed 1 card for install/use), SATA Lite-On DVD-RW drive. No IDE devices installed. BIOS setup for OS X's SATA AHCI.
Originally I was trying with a different drive and install but could not get things to work. So I was using an iBoot boot CD with ATI support. I was about to give up when I decided to give it a try with another drive. Being a Mac person I happened to have another hard drive laying around with Mac OS X 10.6 installed on it. In fact it was a restore of 10.6.2 Apple had done on my MacBook Hard Drive when they replaced it, I never touched it since I had a larger one replace it, so it was sitting in my room untouched and ready to go.
I plugged in the notebook SATA drive into my PC like a normal SATA drive and put in the iBoot ATI CD disc to try it out. I selected the Mac Hard Drive and didn't enter any special values or instructions... after a minute or so of white text scrolling by it stopped. I didn't see a picture on the screen. However I tried the 2nd monitor port on my graphics card and BAM, a picture!!
My monitor has a VGA and DVI hookup, so on the ATI 4670 there are two DVI slots. Port 1 I had a VGA adapter on and plugged into my PC, there was no image. But on Port 2 via DVI there was a perfect image of the OS X desktop! :) The Displays system preference in OS X found the display and all it's supported resolutions without a click. The Graphics card is seen as an ATI 4670 and seems to work without issue, maybe this is because the newest iMacs have the same graphics card? I know that booting from a 10.6.0 install did not give me any image except garbled blocks.
It seems that Graphics and Sound are fully supported. I used the "Headphones" selection under sound and it worked right away. DVD player mentions that "Quartz Extreme" is supported as well as HD playback (Click "Supported Features" under the Help menu of DVD Player to see).
Everything worked except for Ethernet, but I downloaded a Asus PQ5 driver and upon reboot that worked perfectly also. :D
I could not be more thrilled. :) If I can help anyone else with a similar setup I'd be happy to. However I am unfamiliar with the specific install on the hard drive, what probably happened was the Apple store probably did an install of 10.6.0, updated it, and installed iLife. :pie: