Apple Mac OS X v10.4 Tiger - Manual (Page 13)

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You need to continue using Mac OS 9 applications.
To continue using Mac OS 9 applications, you need Mac OS 9 installed on your
computer along with Mac OS X. You can install Mac OS X on the same volume as
Mac OS 9 or on a separate volume.
Note: On some computers, you cannot install Mac OS 9 or start up the computer using
Mac OS 9. To use Mac OS 9 applications, open them in the Classic environment. For
more information, see the user’s guide that came with your computer.
You’re not allowed to start the Installer.
If your computer is connected to a network, your network administrator may prevent
you from installing software or upgrading Mac OS X.
The Installer doesn’t open.
If the Installer doesn’t open, restart your computer while holding down the C key to
start up your computer using the install disc.
If the Installer still doesn’t appear, restart your computer and hold down the mouse
button or trackpad button to eject the disc. After your computer starts up, insert the
Mac OS X Install disc and use Startup Disk preferences to select the Install disc as your
startup disk, then restart.
The Installer cannot repair your disk.
If a message says the Installer cannot repair the disk, you may need to erase it. This
deletes all the files on your disk.
Before you erase your disk, you can quit the Installer and back up desired files (copy
them to another disk). When you’re ready to erase the disk, open the Installer, follow
the instructions in “Custom Installations” on page 5, and select “Erase and Install.”
The Installer cannot update the hard disk driver.
The Installer cannot update the drivers for non-Apple hard disks. Use the disk utility
recommended by the manufacturer to update the disk’s driver before installing
Mac OS X. Make sure to use a version of the utility that is compatible with Mac OS X.
The installation was not successful.
If you were unable to install Mac OS X, try the following:
 Disconnect external devices you don’t need during installation.
 Use Disk Utility to repair your hard disk.
After disconnecting unnecessary devices, start up from the Mac OS X Install disc. Select
your language and click the forward arrow. To open Disk Utility, choose Utilities > Disk
Utility. Select the volume on which you want to install and click Repair Disk. After
repairing any problems, quit Disk Utility and click Continue to try installing again.