Apple Workgroup Server 8550 - Manual (Page 92)

The server is turned on but the screen is dark.
The server or the monitor is not getting power, a program has darkened the
screen, or the monitor controls are not adjusted properly.
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If you use a screen-saver program or the Energy Saver control panel to
dim the screen, press a key or move the mouse.
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Check the monitor’s brightness and contrast controls and turn them up
if necessary.
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Check that the monitor is turned on.
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Check that the power cord and monitor cable are plugged in and firmly
connected to the server and that the electrical outlet has power. The
power light on the server’s front panel should be on.
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If you have more than one monitor, and only one is dark, check that it is
set up correctly in the Monitors & Sound control panel.
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If none of these steps solves the problem, you may need to reset your
server’s parameter RAM (PRAM). Reset PRAM by turning off the server
and disconnecting all external SCSI devices. Next, restart the server 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.)
A disk icon with a blinking question mark appeared when you started
your server.
The blinking question mark indicates that your server cannot find system
software. You may need to repair a damaged disk, or reinstall system
software.
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Your server may be having a problem recognizing a SCSI device. Turn off
external SCSI devices and restart.
If the server starts up after you turn off your SCSI devices, read the
section on SCSI devices in the setup guide that came with your server for
information on connecting SCSI devices and assigning SCSI ID numbers.
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