Blinking Lights - HP ZBook 14U G5 Maintenance And Service Manual

Items
The sections below are intended for authorized service providers/technicians.
Tips and tricks

Blinking lights

Items
Symptoms
Lights blink on keyboard
lock/num lock keys
Note
Procedures
5. If external video is OK, update BIOS, software, and drivers
on page
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
● If there is video on display, disconnect external display device, open the computer lid
and restart.
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 configuration
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
8. If issue persists (no video), test with external video.
9. If issue persists, test or replace a confirmed working display.
10. If issue persists, replace discrete graphics card.
11. If issue persists, replace system board due to defective video function.
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 identification –
Display" section for location of the magnetic sensor.
Procedures
Possible causes
caps Blinking lights on startup usually indicate a problem with basic functionality of a critical
component (processor, BIOS, graphics cards, memory, etc.) due to loose connection,
defective parts, or recently added parts.
Troubleshooting steps
1. Check for any blink patterns. Count the number of blinks in a sequence, followed by a
pause for a few seconds.
2. See Status, Blinking Lights, and Error Message
troubleshooting lights, and POST error messages on page
3. If internal hardware components (memory, hard drive, etc.) have been recently added, a
component may not be connected properly. Remove and reseat new components
Reseat cables and connections on page
Since the display may not be functional, lights are used to indicate an error.
89) and perform soft reset (9. Soft reset (Default Settings) on page
Windows logo
(11. Test with minimum configuration on page
Display on page 122
Common issues and possible solutions 111
(4. Update BIOS and drivers
+ P for display switcher).
section.
(7. Status lights, blinking light codes,
94) for corrective actions.
98) one at a time.
98) if
99) by
(10.