Technical information

The computer freezes (nothing moves on the screen) after the “happy Macintosh” icon

appears but before the message “Welcome to Macintosh” appears.

To determine the problem, shut down the computer and disconnect all attached equipment. Then try

starting up the computer again.

m If the problem occurs with no equipment attached to the computer, the hard disk may be damaged.

Follow the instructions in “Testing Your Hard Disk” in Chapter 13.

m If the computer restarts normally without any equipment attached, shut the computer down again

and reattach the first piece of equipment; then restart the computer again. Do the same thing with

each additional piece of equipment until you find the piece that is causing the problem. Have that

piece repaired.

The computer freezes in the middle of displaying icons for system extensions at the

bottom of your screen.

Check first for problems with your extensions. Shut down the computer and try starting up the

computer while holding down the Shift key until you see the message “Extensions off ” in the

“Welcome to Macintosh” box.

m If the computer starts up when your extensions are off, two or more of your extensions may be in

conflict with each other. Turn to “Checking Your System Extensions” in Chapter 13.

m If the computer still freezes during startup, your System Folder may be damaged. Follow the

instructions in “Performing a Clean Installation of System Software” in the “Installing System

Software” section in Chapter 13.

If you can’t start up even if you hold down the Shift key to turn off all extensions, check for problems

with your equipment. Shut down the computer and disconnect all attached equipment. Then try