Now that our Mini9s are getting on in years, I thought I would alert everyone to an issue I had. Sound had stopped working on my Mini9 and I was blaming it on a bad upgrade. After wiping, and fully reinstalling 10.6.3 I still couldn't get it to work. I tried Linux, still no luck. I decided to take the machine apart and notice that the 4 speaker wires running through the hinge to the screen had all broken off. I soldered in some small wires to bridge the gap (the wires are not long enough to simply re-join) and sealed the with some heat shrink. Sounds now working perfectly again. Anyways, if you're having sound issues and can't get anything else to work this is probably worth checking.