Apple supplies various alternate boot modes for OS X, but sometimes systems get stuck in them.
Cache clearing to the rescue
More problems from Apple's new keyboards.
OS X Odds & Ends: Force Quit from Dock; Disable single user mode; Type/Creator vs. file extensions
With Leopard and prior versions of OS X, one of the popular maintenance utilities was AppleJack, which is a free SourceForge project and ran in the Terminal (preferably Single User mode) as an easy-to-access way to run a bout of cleaning functions on the Mac. AppleJack so far has been incompatible with Snow Leopard, but with today's update the Snow Leopard incompatibility has been squashed.
Many articles you read on Mac troubleshooting mention troubleshooting methods like resetting the NVRAM, starting in FireWire Target Disk Mode, starting in Safe Mode, or starting in Single-User Mode, but fail to explain exactly how to do that.
When Macs boot up, users have the option to provide key sequences for various boot options: reset PRAM, select boot volume, single-user mode, etc. However, some users may experience problems were