HP Compaq Businessdc7600, Руководство по обслуживанию и справочник

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D–12 390742-001 Service Reference Guide, dc7600
Troubleshooting Without Diagnostics
Blank screen and the
power LED flashes Red
seven times, once every
second, followed by a two
second pause, and the
computer beeps seven
times. Beeps continue for
five iterations after which
the LED flashes will
continue until the problem
is resolved. System board failure
(ROM detected failure
prior to video.) Replace the system board.
Monitor does not function
properly when used with
energy saver features. Monitor without energy
saver capabilities is
being used with energy
saver features enabled. Disable monitor energy saver
feature.
Dim characters. The brightness and
contrast controls are not
set properly. Adjust the monitor brightness and
contrast controls.
Cables are not properly
connected. Check that the graphics cable is
securely connected to the graphics
card and the monitor.
Blurry video or requested
resolution cannot be set. If the graphics controller
was upgraded, the
correct video drivers
may not be loaded. Install the video drivers included in
the upgrade kit.
Monitor is not capable
of displaying requested
resolution. Change requested resolution.
Graphics card is bad. Replace the graphics card.
The picture is broken up,
rolls, jitters, or flashes. The monitor connections
may be incomplete or
the monitor may be
incorrectly adjusted. 1. Be sure the monitor cable is
securely connected to the
computer.
2. In a two-monitor system or if
another monitor is in close
proximity, be sure the monitors
are not interfering with each
other’s electromagnetic field by
moving them apart.
3. Fluorescent lights or fans may
be too close to the monitor.
Monitor needs to be
degaussed. Degauss the monitor.
Solving Display Problems (Continued)
Problem Cause Solution