Troubleshooting Operating System
From Applepedia
If your computer freezes while starting up, there's probably something wrong with your installation of the system.
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Hardware problems
- You can quickly rule out problems with your CPU, RAM and Logic Board by booting from your system CD/DVD.
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Classic Mac OS: Extensions off
- Start up with the shift key held down to turn off any extensions.
- If it boots fine with the shift key down, you probably have some extensions conflict. Reboot with the space bar, and you'll get the Extensions Manager. Here you can disable any suspicious extensions (perhaps the one who's icon just showed up, or the one after).
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Mac OS X: Verbose boot
- Hold down ⌘-V when turning on your Mac to enable verbose boot up. This will show you the UNIX guts of the OS X boot process, perhaps giving you useful debugging information.
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Mac OS X: Single user mode
- If you hold down ⌘-S when turning on your Mac, it will boot you to a command line, in Single User mode. This mode can be used to fsck your boot disk, and perform other repairs.
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Mac OS X: Repair permissions
- Sometimes, screwed up permissions can stop the boot process. Start your computer from your system CD/DVD, and run Disk Utility. Use Disk Utility to Repair Permissions.
