Apple PowerBook G3 - Manual (Page 60)

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 installed a RAM expansion card in your
computer, check Appendix C to make sure the card is properly installed. If
you purchased an expansion card from a third-party manufacturer, contact
the manufacturer 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 above the top row of keys on the keyboard, to the right of 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
and expansion bay 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 6 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.
When you start up the computer, you see a message about the system software.
m The system software on the startup disk you’re using may be incomplete or
damaged, or may be the wrong version. Make sure you’re using the correct
disk as a startup disk. (You can start up from the CD that came with your
computer by pressing the letter “c” as the computer starts up.)
m If you’re sure you’re using the correct startup disk, you may need to
reinstall system software. See “Reinstalling System Software” in Chapter 6.
60 Chapter 5