HP ZBook 17 Maintenance and Service Guide - Page 129
Blinking lights, Items, Procedures, Verify display
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Items Procedures 3. Perform hardware reset (8. Hard reset on page 102) 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 94) and perform soft reset (9. Soft reset (Default Settings) on page 103) 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 configuration (11. Test with minimum configuration on page 104) 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 126 section. 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. 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 identification - Display" section for location of the magnetic sensor. Blinking lights Items Symptoms Lights blink on keyboard caps lock/num lock keys Procedures Possible causes 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. Common issues and possible solutions 115