10 Chapter 1
You Hear Tones When Starting Up
If you hear one or more tones when you attempt to start up your computer, this typically
indicates a problem with the computer’s hardware.
m One tone: Your computer doesn’t detect any memory in your system. See “Make Sure
Memory and Expansion Cards Are Installed Correctly” on page 22.
m Two tones: Your computer detects incompatible memory. See “Make Sure Memory and
Expansion Cards Are Installed Correctly” on page 22.
m Three or more tones: Contact an Apple-authorized service provider. See the service and
support information that came with your computer.
Screen Shows Single Folder With Blinking Question Mark
m Make Sure External Equipment Is Properly Connected and Turned On (p. 15)
m Resolve SCSI ID Conflicts (p. 17)
m Re-Bless the System Folder (p. 18)
m Make Sure You’re Using the Correct Disk as the Startup Disk (p. 19)
m Resolve System Extension Conflicts (p. 20)
m Reset the PRAM (p. 22)
m See Chapter 3, “Testing and Repairing Your Hard Disk,” on page 27.
m See Chapter 4, “Reinstalling Your Computer’s Software,” on page 33.
Computer Freezes or a System Error Message Appears
m Take Notes (p. 12)
m Quit Open Applications (p. 13)
m Make Sure External Equipment Is Properly Connected and Turned On (p. 15)
m Make Sure You’re Using the Correct Disk as the Startup Disk (p. 19)
m Resolve System Extension Conflicts (p. 20)
m See Chapter 3, “Testing and Repairing Your Hard Disk,” on page 27.
m See Chapter 4, “Reinstalling Your Computer’s Software,” on page 33.
Keyboard or Mouse Doesn’t Work
m Take Notes (p. 12)
m Make Sure External Equipment Is Properly Connected and Turned On (p. 15)
m Resolve System Extension Conflicts (p. 20)
m See Chapter 3, “Testing and Repairing Your Hard Disk,” on page 27.
m See Chapter 4, “Reinstalling Your Computer’s Software,” on page 33.
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