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D–4 431672-001 Service Reference Guide
Troubleshooting Without Diagnostics
Some software
applications, especially
games, are stressful on the
graphics subsystem.
1. Lower the display resolution for
the current application or consult
the documentation that came with
the application for suggestions on
how to improve performance by
adjusting parameters in the
application.
2. Add more memory.
3. Upgrade the graphics solution.
Cause unknown. Restart the computer.
Blank screen (no video). Monitor is not turned on
and the monitor light is
not
on.
Turn on the monitor and check that the
monitor light is on.
The cable connections are
not correct.
Check the cable connection from the
monitor to the computer and to the
electrical outlet.
Blank screen (no video)
(continued).
You may have a screen
blanking utility installed or
energy saver features are
enabled.
Press any key or click the mouse button
and, if set, type your password.
Computer is in standby
mode.
Press the power button to resume from
standby mode.
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CAUTION: When attempting to resume from standby mode, do not hold down the
power button for more than four seconds. Otherwise, the computer will shut down and
you will lose any unsaved data.
You are using a fixed-sync
monitor and it
will not sync
at the resolution chosen.
Be sure that the monitor can accept
the same horizontal scan rate as the
resolution chosen.
The VGA/BNC selector
switch on the monitor
(some models) is not
properly set.
Set the selector switch to agree with
the cable connection.
Bad monitor. Try a different monitor.
Power LED is flashing
and computer will not
start.
Initernal error has occurred
and the computer is
flashing a code.
Refer to “Interpreting Diagnostic Lights
and Audible Codes” to interpret the
error code.
Problem Cause Solution