IBM 6644 - Manual (Page 63)

50 User Guide
Display/monitor problems
General problems
Symptom Action
General monitor
problems 1. Make sure the brightness controls are adjusted correctly.
2. Some IBM monitors have their own self-tests. If you
suspect a problem with your monitor, see “Running the
IBM Enhanced Diagnostics program” on page 57 and
run diagnostics on the monitor.
If you cannot find the problem, check the other listings on
monitor problems in this table.
Blank screen Verify that the brightness controls are adjusted correctly.
If you cannot correct the problem, have the computer
serviced.
Unreadable characters Have the computer serviced.
The monitor works when
you turn on the computer,
but goes blank after some
period of computer
inactivity. The computer is probably set for energy savings, using one of
the power management settings. If the power management
features are enabled, disabling or changing the settings
might solve the problem (see “Other settings in the
Configuration/Setup Utility program” on page 31).
Symptom Action
The computer does not
start when you press the
power button. Verify that:
1. All cables are securely connected to the proper
connectors on the computer. For the location of the
connectors, see “Connecting cables” on page 9.
2. The computer cover is properly installed.
If you cannot correct the problem, have the computer
serviced.