HP ZBook 14u G6 - Page 118

Table 8-15 Issues, possible causes, and xes (continued)
Items Procedures
● Hard drive light blinking and hard
drive noise
NOTE: Assume the computer has not previously been set up for multiple displays.
Troubleshooting steps
Quick check
1. Verify that system light activity is OK.
2. Remove all external devices, including docking station. Recently added hardware
and/or applications may cause graphics driver conict and result in loss of video.
3. Perform hardware reset (8. Hard reset on page 91) and verify that HP Logo is presented
correctly on display screen when pressing F10.
4. Test with external monitor via VGA port (or DisplayPort, HDMI, etc). Press power button
and close the computer lid to force video output to external video. If unsuccessful,
contact HP service.
5. If external video is OK, update BIOS, software, and drivers (4. Update BIOS and drivers
on page 85) and perform soft reset (9. Soft reset (Default Settings) on page 92) if
needed. Go to next step to verify display.
Verify display
● When booting to Windows, determine whether image appears on display screen (via
Windows Screen Solutions or Windows logo + P for display switcher).
● If there is video on display, disconnect external display device, open the computer lid
and restart.
The sections below are intended for authorized service providers/technicians.
1. Verify Power Good lights are on to be sure that system board power is functional.
2. Reseat display cable connection on system board.
3. Reseat display cable connection on display panel side.
4. Examine and reseat major components, such as hard drive, memory.
5. Test with minimum conguration (11. Test with minimum conguration on page 93) by
removing hard drive to isolate operating system issues and testing video in F10 Setup.
6. If video is present, restart and retest the computer.
7. If video is present but bad, go to Display on page 115 section.
8. If issue persists (no video), test with external video.
9. If issue persists, test or replace a conrmed working display.
10. If issue persists, replace discrete graphics card.
11. If issue persists, replace system board due to defective video function.
Tips and tricks Swipe a metal piece (screwdriver) over wireless/mute buttons to act as if closing lid to force
video output to external display device. See the “External component identication –
Display” section for location of the magnetic sensor.
104 Chapter 8 Troubleshooting guide