HP Elite Dragonfly 13.5 Maintenance and Service Guide - Page 90

POST, No video (with power), Use the following s to troubleshoot Power-on Self Test issues.

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POST Use the following sections to troubleshoot Power-on Self Test issues. No video (with power) Use this information to troubleshoot video issues. Table 6-15 Issues, possible causes, and fixes Items Procedures Symptoms Possible causes ● No video (black or blank image) Failed display but have power Failed critical components (memory, hard drive, system board) ● Light activity Loose connection ● No error messages Recently added hardware ● Fan noise NOTE: These suggestions assume that the computer has not previously been set up for ● Hard drive light blinking and hard multiple displays. drive noise Troubleshooting steps Quick check 1. Verify that system light activity is OK. 2. Remove all external devices, including docking station. Recently added hardware or applications may cause graphics driver conflict and result in loss of video. 3. Perform hardware reset (8. Hard reset on page 68) 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, or other). 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 62), and perform soft reset (9. Soft reset (Default Settings) on page 69) 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 the display, disconnect external display device, open the computer lid, and restart. The following steps are for authorized providers or technicians. 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 configuration (11. Test with minimum configuration on page 70) by removing hard drive to isolate operating system issues and testing video in F10 Setup. POST 81

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POST
Use the following sections to troubleshoot Power-on Self Test issues.
No video (with power)
Use this information to troubleshoot video issues.
Table 6-15
Issues, possible causes, and fixes
Items
Procedures
Symptoms
●
No video (black or blank image)
but have power
●
Light activity
●
No error messages
●
Fan noise
●
Hard drive light blinking and hard
drive noise
Possible causes
Failed display
Failed critical components (memory, hard drive, system board)
Loose connection
Recently added hardware
NOTE:
These suggestions assume that 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 or
applications may cause graphics driver conflict and result in loss of video.
3.
Perform hardware reset (
8. Hard reset
on page
68
) 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, or other). 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
62
), and perform soft reset (
9. Soft reset (Default Settings)
on page
69
) 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 the display, disconnect external display device, open the computer
lid, and restart.
The following steps are for authorized providers or technicians.
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 configuration (
11. Test with minimum
configuration
on page
70
) by
removing hard drive to isolate operating system issues and testing video in F10 Setup.
POST
81