Apple Power Macintosh 4400 - Manual (Page 93)

8 Open the Extensions Manager control panel by choosing Control Panels from the
Apple ( K ) menu. When the Control Panels window appears, double-click the Extensions
Manager icon.
9 From the Sets pop-up menu, choose the name you gave your set of extensions in step 3
of these instructions.
This restores your original set of extensions.
10 Restart your computer to activate the extensions.
Solutions to common problems
This section contains descriptions of problems you may experience with your
computer. Some problems may be caused by your CD-ROM drive, so if you
don’t find your problem here, check the section “Solutions to CD-ROM
Problems” later in this chapter.
The computer is turned on but the screen is dark.
One of the following is probably the cause:
m The Macintosh or the monitor is not getting power.
Check that the monitor is plugged in and turned on and that the monitor
cable is firmly connected to both the computer and the monitor.
m Your computer has gone to sleep after a period of inactivity.
Wake it up by pressing any key on the keyboard except Caps Lock. See
“Saving Energy With the Energy Saver Control Panel” in Chapter 1 for
more information about computer sleep.
m You have a screen saver program that darkens the screen when the
computer has not been used for a certain period of time.
Press a key or move the mouse to turn off the screen saver.
m The monitor’s brightness control (¤) is not adjusted properly.
Check the monitor’s brightness control and turn it up if necessary.
93 Troubleshooting