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Problems with hard disks
The computer won’t start up from the internal hard disk, or the hard disk icon doesn’t
appear on the desktop.
m There may be a temporary software problem. Turn off the computer, wait
at least 10 seconds, and then turn it on again.
m There may be a problem with your startup disk or with its system software.
See “Testing and Repairing Your Hard Disk” in Chapter 11, “Diagnostic
Te c hniques.”
The computer is using the wrong disk as a startup disk.
m Open the Startup Disk control panel and make sure the correct disk is
selected. Then restart the computer.
m If you’re trying to start up from an external hard disk, your computer may
be having a problem recognizing the disk, which is a SCSI device. Refer to
both the manual that came with the hard disk and Chapter 7, “Connecting
Additional Equipment,” which has information on the proper way to
connect SCSI equipment and assign SCSI ID numbers.
m Reset the PRAM and NVRAM by following the instructions in “The
Computer Makes an Unusual Sound at Startup” earlier in this chapter.
Problems with your computer’s speed
Your computer’s performance decreases
m If you notice a decrease in your computer’s speed and general performance
after you install a control panel or system extension, it may be because the
software is not compatible with either Macintosh computers built with the
PowerPC microprocessor or with other system extensions.
To f ind out if a system extension or control panel is the problem, follow
the instructions in the section “Checking Your System Extensions” in
Chapter 11, “Diagnostic Techniques.”
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Solutions to Common Problems