Ok need a little more help on this subject. I did everything mentioned above and was able to boot into my ML drive. I deleted the DSDT as well as the audio plist files. Then I, not really thinking, turned off the machine without running multi beast. Now i can't boot into ML. I get to the apple logo with the swirling logo at the bottom and it never gets past that. I followed the same instructions and was able to boot to my lion drive. I have not deleted anything on the Lion drive. From within Lion I tried to move the DSDT file into the extras folder on the ML drive, restarted to that drive, and did the same DSDT=null. Again it still got to the apple logo swirling at the bottom. My Lion drive is pretty much up to date because I have most of my apps on a regular hard drive. I would rather have my ML drive up and running, but I could always clone Lion, update and get to ML that way. Unless someone has any other advice??? Thanks