I can get things working, but not everything at once. Things have been sketchy since I upgraded from 10.4.8. After finally taking a break from just guitar and school work, I got Pro Tools LE to install an start again (stability unknown) on 10.5.1. After I did that, Ableton Live and Reason just randomly started failing to launch...they bounce in the dock indefinitely and don't start. Granted, I've only waited a few minutes for them to start, but if they don't start in 5 minutes, they might as well not start at all as far as I'm concerned. It's sad, but the only times I'm actually happy with any computer is when I'm not using any recording/production software. I've updated prebinding. I've repaired disk permissions. I've done everything I know to do, but as soon as Pro Tools gets installed, everything else stops working. The only thing that makes my guitar rig (including everything) cost more than the software I've purchased is the attenuator. I've spent more on DJ gear, but that stuff is just expensive, and it's not a wide margin. And none of it works. This is pathetic.