18 Chapter 1
Increase the Memory Available for System Software
If you’re having trouble starting up your computer, there may not be enough memory to
load all the system software extensions you’ve installed. Restart the computer, holding down
the Shift key until you see the message “Extensions Disabled” in the “Welcome to Mac OS”
box. Then try the following:
m Tu rn on (or increase) virtual memory in the Memory control panel. Your computer will
perform well with virtual memory set up to twice the amount of RAM in the computer; for
best performance, limit virtual memory to 1.5 times the amount of RAM.
m Reduce the size of the disk cache in the Memory control panel. Start by using the default
setting. Do not set the disk cache below 256K.
m If you use a RAM disk, reduce its size or turn it off in the Memory control panel.
m Use the Extensions Manager control panel to turn off extensions. To help you determine
which extensions you may want to turn off, in the Extensions Manager control panel, click
the arrow next to “Show item information.” Then click an item in the list. You can also use
the Extensions Manager to create different sets of extensions for special situations.
You need to restart the computer for these changes to take effect. See Mac OS Help
(available in the Help menu) for more information about using virtual memory, a RAM disk,
and the Extensions Manager.
If the problem persists, try performing a clean installation of system software. See
“Performing a Clean Installation” on page 36.
If none of these suggestions work, you may need to install additional memory (RAM) in your
computer. For more information, see the documentation that came with your computer.
Re-Bless the System Folder
If your computer is not recognizing the system software, the System Folder may need to be
“re-blessed.” If the System Folder is “blessed,” the Mac OS logo is on the folder’s icon.
1 Start up your computer from the software install CD.
See Chapter 2, “Starting Up From a CD,” on page 25.
2 Open the System Folder on your hard disk.
3 Double-click the System file.
If you are unable to open the System file, you may need to reinstall the system software. See
Chapter 4, “Reinstalling Your Computer’s Software,” on page 33.
4 After the System file opens, close the file and System Folder windows and restart your
computer.
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