So, I did the install following this fantastic guide (thanks to all involved) and everything was working great (video, audio, bonjour, sleep, the whole nine yards)! When the 10.6.2 update came out, I cloned my install to a different partition to play with. After following the netkas suggestions, I have some unusual results. First, 10.6.2 will only boot with the -f option; whenever I do not do that, I get an immediate KP. Second even when I boot with -f, I do not have functional audio, even though I'm using the same LeagacyALC883 kext that worked with 10.6.1. One thing I've noticed is that in my working install (10.6.1), there is an an Extensions.mkext in my /Extra folder, but this does not exist in the 10.6.6 install. Could this be part of the problem, and how should I go about fixing it? Thanks again.