Table 7-15 Issues, possible causes, and xes (continued)
Items Procedures
1. Reseat display cable connection on system board.
2. Reseat display cable connection on display panel side.
3. Examine and reseat major components, such as hard drive and memory.
4. Test with minimum conguration (11. Test with minimum conguration on page 118) by
removing hard drive to isolate operating system issues and testing video in F10 Setup.
5. If video is present, restart and retest the computer.
6. If video is present but bad, go to Display on page 142 section.
7. If issue persists (no video), test with external video.
8. If issue persists, test or replace a conrmed 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
7-16 Issues, possible causes, and xes
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 112) 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 116) 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.
ENWW Common issues and possible solutions 133
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