AppleJack

If you're looking for a powerful troubleshooting tool, AppleJack might be just what you need. With this software, you can easily troubleshoot your computer even if the GUI won't load or you don't have a startup CD handy. This program runs in Single User Mode, making it ideal for those times when you need a reliable method which doesn't require additional tools.

Using AppleJack is simple, thanks to its menu-based interface. With this program, you can repair your disk, fix any permission errors, validate the system's preferences files, and get rid of corrupted cache files. This suite of tools can work wonders in getting your machine back on track, even when it seems like it's beyond help.

Best of all, you don't need another startup disk to use AppleJack. To get started, just restart your computer in Single User Mode (SUM) by holding down the command and s keys at startup. From there, you can start using AppleJack by typing "applejack", "applejack auto", or "applejack auto restart". The program will handle the rest, running through all the necessary tasks and even rebooting your computer automatically if needed.

Overall, AppleJack is a reliable, powerful tool that can be a lifesaver in a wide range of situations. If you need a great option for troubleshooting your computer, this software is definitely worth considering.