Apple 8500/150 Series Solutions to common problems, Computer is turned on but the screen is dark

Solutions to common problems

This section contains descriptions of problems you could experience with your computer. Some problems may be caused by your CD-ROM drive, so if you don’t find your problem here, be sure to 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:

mThe computer is in sleep mode. Press a key on the keyboard.

mYou have a screen saver program that darkens the screen when the computer has not been used for a certain period.

Press a key or move the mouse to turn off the screen saver.

mThe monitor’s brightness control (¤) is not adjusted properly. Check the monitor’s brightness control and turn it up if necessary.

mThe Macintosh or the monitor is not getting power.

If you have a separate monitor, 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.

Check that the computer’s power cord is firmly connected to the computer and plugged into a grounded electrical outlet and that the outlet has power.

If you have more than one monitor, and only one is dark, check that it is set up correctly in the Monitors control panel. For information on using

more than one monitor, see the “Monitors” topic of Macintosh Guide, available in the Guide (h) menu.

mIf none of these steps solves the problem, you may need to reset your computer’s parameter RAM (PRAM). Reset PRAM by turning off the

computer and disconnecting all external SCSI devices. Next, restart the Macintosh while holding down the key combination x-Option-p-r. Wait for the second startup chime, then release the keys. (Note that the “caps lock” key must be in the up position. This procedure won’t work with the uppercase “P” and “R” keys.)

If you are displaying video from your computer on a television screen, it is normal for your computer monitor to be dark.

Troubleshooting 85