HP Z200 - Small Form Factor Workstation Maintenance And Service Manual page 151

Table 6-4 Display problems (continued)
Problem
The display works properly during
the POST but goes blank when the
operating system starts.
Power LED flashes red 6 times
(once every second), followed by a
2–second pause, and then the
computer beeps 6 times.
Monitor does not function when
used with Energy Saver features.
Dim characters
Blurry video or requested
resolution cannot be set.
The picture is broken up, rolls,
jitters, or flashes.
Vibrating or rattling noise coming
from inside a CRT monitor when
powered on.
Clicking noise coming from inside a
CRT monitor.
High pitched noise coming from
inside a flat-panel monitor.
ENWW
Cause
The display settings in the
operating system are
incompatible with your
graphics card and monitor.
Prevideo graphics error.
Monitor without Energy Saver
capabilities is being used with
Energy Saver features
enabled.
The brightness and contrast
controls are not set properly.
Cables are not properly
connected.
If the graphics controller was
upgraded, the correct video
drivers might not be loaded.
Monitor cannot display
requested resolution.
The monitor connections might
be faulty, or the monitor might
be incorrectly adjusted.
Monitor must be degaussed.
Monitor degaussing coil has
been activated.
Electronic relays have been
activated inside the monitor.
Brightness and contrast
settings are too high.
Solution
1. For Windows, restart your computer in VGA mode.
2. After the operating system starts, change the display
settings to match those supported by your graphics
card and monitor.
3. Refer to your operating system and graphics card
documentation for information about changing display
settings.
For systems with a graphics card:
1. Reseat the graphics card.
2. If the card requires external power, make sure the
power cable is properly connected.
3. Replace the graphics card.
4. Replace the system board.
Disable the monitor Energy Saver feature.
Adjust the monitor brightness and contrast controls.
Verify that the graphics cable is connected to the graphics
card and the monitor.
Install the video drivers included in the upgrade kit, or
download and install the latest drivers for your graphics
card from http://welcome.hp.com/country/us/en/
support.html.
Change the requested resolution.
1. Be sure the monitor cable is securely connected to the
computer.
2. In a multiple CRT monitor system, ensure that the
monitors' electromagnetic fields are not interfering
with each other . Move them apart if necessary.
3. Move fluorescent lights or fans that are too close to
the CRT monitor.
Degauss the monitor.
None. It is normal for the degaussing coil to be activated
when the monitor is powered on.
None. It is normal for some monitors to make a clicking
noise when turned on and off, when going in and out of
Standby mode, and when changing resolutions.
Lower brightness and contrast settings.
Troubleshooting scenarios and solutions 139