Apple PowerBook (2400c) User Manual download pdf (Page 82)

m Follow these steps to reset the PRAM:

1. Locate the keys Command (x), Option, P, and R.

2. Make sure the Caps Lock key is not down.

3. Restart your Macintosh (using the Command [x], Control, and Power

keys or the reset button, if necessary). Immediately after hearing the

startup sound, press the Command (x), Option, P, and R keys

simultaneously.

If you don’t hold down the key combination within 5–10 seconds after

you restart, you may need to repeat steps 1–3.

4. Hold down the keys until you hear the startup sound again.

5. If the computer shuts itself off, press the Power key to turn it back on.

6. When the computer has finished starting up, restore any custom control

panel and network settings.

m If nothing happens after you reset the PRAM, there may be a problem with

a RAM expansion card. If you had a RAM expansion card installed in your

computer, contact the dealer who installed the card for help.

See also “The Computer Makes Unusual Sounds” in the section “Other

Problems While Working” later in this chapter.

The computer starts up, but the desktop doesn’t appear.

m The screen brightness may be turned down. Adjust the brightness control,

located at the base of the screen, in the center.

m The computer may be trying to start up using an external hard disk that

does not contain the correct system software. Disconnect the external hard

disk and restart your computer. (This can also happen with PC Card

drives.)

m Start up the computer, holding down the Shift key until you see the

message “Extensions Off” in the “Welcome to Macintosh” box. If the

computer starts up, turn to Chapter 7 and try the steps given in the section

“Checking Your System Software Extensions.” You can go directly to the

Extensions Manager control panel by holding down the Space bar during

startup.

Chapter 6

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Apple PowerBook (2400c) User Manual Page 82