Hi, I've got 10.8.1 running on Optiplex 755. What works: Startup/ Shutdown/ Restart, Ethernet, Audio (with Voodoo HDA 2.7.3), graphics (ATI 5670 partly recognised as ATI5000 delivering resolution of 1680 x 1050 @ 60 Hz)- QE/CI (Chess works), App Store. What doesn't work: Sleep, DVD player (see below), likely other things I havent found yet, occasional KP's- just run myHack QuickFix and seems good to go. Install Method: myHack followed by boot fix from here. I've been trying to only install vital kexts- see here for clues. I used Chameleon Wizard to edit the org.chameleon.boot.plist: My Specs are: 3GHz C2D, 4GB Ram, ATI 5670. I've pimped out the system with 4 HD's, by disconnecting the little used DVD and substituting an SSD- although the SSD is propped up on an angle The OS's are: a 64GB ssd running ML, a 500GB HD running Lion 10.7.4 (soon to be upgraded to ML), an 80GB HD with a Carbon Copy Clone of the SSD, and a 160GB running Windows 7. I also got an IR controller from eBay which worked oob - and allows rudimentary remote control of VLC- the main purpose I wanted. Question for the experts: Hardware Monitor says that my CPU 0 & 1 are running at 1992 MHz, while About This Mac says the Processor is 2.99 Ghz Intel Core 2 Duo- which I presume means that the CPUs aren't running at full speed? If so- how to change? To Do: see if system can be amended to recognise ATI 5670, experiment with DSDT Let me know if you have any questions. Thanks to the Hackintosh community for making this possible