HP Z1 Maintenance And Service Manual page 78

Table 4-4
Problem
Power LED flashes red
6 times (once every
second), followed by a
2-second pause,
followed by 6 beeps.
Dim characters
Blurry video or
requested resolution
cannot be set.
The picture is broken
up, rolls, jitters, or
flashes.
High pitched noise
coming from inside a
flat-panel monitor.
70 Chapter 4 Diagnostics and troubleshooting
External display problems (continued)
Cause
Prevideo graphics error.
Processor does not support
graphics output and no discrete
graphics card is installed.
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.
Brightness and contrast settings
are too high.
Solution
Try these solutions in this order:
Reseat the graphics card if using nVidia graphics;
●
reseat the processor if using Intel HD Graphics.
Replace the graphics card if using nVidia graphics or
●
replace the processor if using Intel HD graphics.
Replace the system board.
●
Either:
Install a processor with Intel HD Graphics.
●
Install a supported graphics card.
●
Adjust the monitor brightness and contrast controls.
1.
Verify that the monitor cable is securely connected to
the computer and the monitor.
2.
Verify that internal Rear IO DP/LAN cable is
connected to the system board and the Rear I/O
board:
a.
Open the computer.
b.
Verify the Rear IO DP/LAN Cable is connected
to CON6701 on the system board and J16 on
the Rear I/O board (on the left bottom side).
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 resolution.
1.
Verify that the monitor cable is securely connected to
the computer and the monitor.
2. Verify that internal rear IO DP/LAN cable is
connected to the system board and the rear I/O
board:
a. Open the computer.
b. Verify the rear IO DP/LAN cable is connected to
CON6701 on the system board and J16 on the
rear I/O board (on the left bottom side).
Degauss the monitor.
Lower brightness and contrast settings.