Thanks Tony for this and all your guides. I have gotten 10.6.2 working (mostly) on my system with an ASUS P7P55D, i5 750, ATI 4890. Also my processor is overclocked to 4GHz and works splendidly. Using your ATI Boot CD, I booted the installer using safe mode, and was able to install successfully. In order to get QE/CI working with my 4890, I used the QE/CI Exotic package from netkas, that you can download here. http://forum.hardmac.com/index.php?showtopic=7253 Just try to install it, and it will need to update some things then restart, and run the package and restart again. Voila! That's it! The remaining problem is getting audio to work, there seems to be no solution for this motherboard that I can find. I read on insanelymac that some people have had limited success with VoodooHDA and nothing else works. The board has a VIA 1828S chip for the onboard audio. I hope that helps anyone who might have a similar system to mine. If anyone has any suggestions as to the audio problem, or questions about installing with the 4890 fire away. EDIT: Changed the Link. Added some info.