HP Elite Dragonfly 13.5 Maintenance and Service Guide - Page 91

Blinking lights, Diagnostic error messages

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Table 6-15 Issues, possible causes, and fixes (continued) Items Procedures 5. If video is present, restart and retest the computer. 6. If video is present but bad, go to Display on page 92 section. 7. If issue persists (no video), test with external video. 8. If issue persists, test or replace a confirmed working display. 9. If issue persists, replace discrete graphics card. 10. If issue persists, replace system board because of defective video function. Tips Swipe a metal piece (screwdriver) over wireless or mute buttons to act as if closing lid to force video output to external display device. Blinking lights Use this information to interpret blinking lights on the computer. Table 6-16 Issues, possible causes, and fixes Items Procedures Symptoms Possible causes Lights blink on keyboard caps lock/num lock keys Blinking lights on startup usually indicate a problem with basic functionality of a critical component (processor, BIOS, graphics cards, memory, and so on) because of a 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 (7. Status lights, blinking light codes, troubleshooting lights, and POST error messages on page 65) for corrective actions. 3. If internal hardware components (such as memory, hard drive) have been recently added, a component may not be connected properly. Remove and reseat new components (10. Reseat cables and connections on page 69) one at a time. Note Because the display might not be functional, lights are used to indicate an error. Diagnostic error messages Use the information in the table to help you understand diagnostic error messages. Table 6-17 Issues, possible causes, and fixes Items Procedures Symptoms ● Computer has power ● POST error message displays (Windows logo has not yet appeared) Possible causes Diagnostic error messages indicate a problem. There may be a problem with the instruction being sent from the BIOS to a hardware component (for example, keyboard failures), or incompatible hardware. Can usually be resolved by installing updated firmware for the component. 82 Chapter 6 Troubleshooting guide

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Table 6-15
Issues, possible causes, and fixes
(continued)
Items
Procedures
5.
If video is present, restart and retest the computer.
6.
If video is present but bad, go to
Display
on page
92
section.
7.
If issue persists (no video), test with external video.
8.
If issue persists, test or replace a confirmed working display.
9.
If issue persists, replace discrete graphics card.
10.
If issue persists, replace system board because of defective video function.
Tips
Swipe a metal piece (screwdriver) over wireless or mute buttons to act as if closing lid to
force video output to external display device.
Blinking lights
Use this information to interpret blinking lights on the computer.
Table 6-16
Issues, possible causes, and fixes
Items
Procedures
Symptoms
Lights blink on keyboard
caps
lock
/
num lock
keys
Possible causes
Blinking lights on startup usually indicate a problem with basic functionality of a critical
component (processor, BIOS, graphics cards, memory, and so on) because of a 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 (
7. Status lights, blinking light codes,
troubleshooting lights, and POST error messages
on page
65
) for corrective actions.
3.
If internal hardware components (such as memory, hard drive) have been recently
added, a component may not be connected properly. Remove and reseat new
components (
10. Reseat cables and connections
on page
69
) one at a time.
Note
Because the display might not be functional, lights are used to indicate an error.
Diagnostic error messages
Use the information in the table to help you understand diagnostic error messages.
Table 6-17
Issues, possible causes, and fixes
Items
Procedures
Symptoms
●
Computer has power
●
POST error message displays
(Windows logo has not yet
appeared)
Possible causes
Diagnostic error messages indicate a problem. There may be a problem with the instruction
being sent from the BIOS to a hardware component (for example, keyboard failures), or
incompatible hardware. Can usually be resolved by installing updated firmware for the
component.
82
Chapter 6
Troubleshooting guide