When things on your Mac go kablooie, the incredible AppleJack repair utility is the single best pro tip you can be given. Developed by Kristofer Widholm, AppleJack is run when you boot into single-user mode and will repair your disks and permissions, flush your caches, validate your preference files, and — in general — give your Mac something of a software tune-up.
The only problem with AppleJack is that it wasn’t compatible with Snow Leopard, but lo, from the tech support angels come an update, giving AppleJack the same license to plunge inside the honeycomb of your Mac’s recesses and fiddle with its digital junk under 10.6 as it did under 10.5.
If you’re worried about your Mac’s health and want to give it a colonic, download AppleJack now.
