HP Z1 Maintenance And Service Manual page 75

Table 4-3 Internal LCD display problems (continued)
Problem Cause
Power LED flashes red Prevideo graphics
6 times (once every error.
second), followed by a
2-second pause, then
the computer beeps 6
times.
Processor does not
support graphics
output and no
discrete graphics card
is installed.
Dim characters Brightness and
contrast controls are
not set properly.
Cables are not
properly connected.
Blurry video or Correct video drivers
requested resolution were not loaded after
cannot be set. graphics controller
upgrade.
The internal LCD
panel cannot display
requested resolution.
The graphics driver is
not working properly.
The picture is broken The internal LCD
up, rolls, jitters, or panel connections to
flashes. the motherboard
might be faulty or the
panel might be
incorrectly adjusted.
The graphics driver is
not working properly.
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.
●
Try either solution:
Install a processor with Intel HD Graphics.
●
Install a supported graphics card.
●
In Windows, go to Control Panel > Power Options, then adjust the
internal LCD panel brightness and contrast controls using the Screen
Brightness slider bar at the bottom of the window.
1. Open the computer.
2. Verify that the LCD Display Cable connects J16 on the system
board to the internal LCD panel connector.
3. Verify that the LCD Sync/backlight Cable connects P2 on the
system board to the sync connector and LED power connector
on the internal LCD panel.
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.
1. Change the resolution to either 2560 x 1440 or 1280 x 720.
2. Update the graphics driver to the latest version available for
your graphics controller.
1. Boot into the OS and uninstall the graphics driver.
2. Restart the computer.
3. Install the latest graphics driver for your graphics controller.
Open the computer.
1. Verify the LCD display cable connects J16 on the system board
to the display connector on the internal LCD panel.
2. Verify that the LCD Ssync/backlight cable connects P2 on the
system board to the sync connector and LED power connector
on the internal LCD panel.
1. Boot into the OS and uninstall the graphics driver.
2. Reboot.
3. Install the latest graphics driver for your graphics controller.
Troubleshooting scenarios and solutions 65