Table 6-15 Issues, possible causes, and fixes (continued)
Items Procedures
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 79) 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 73), and perform soft reset (9. Soft reset (Default Settings) on page
80) 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 81)
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 105 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.
94
Chapter 6 Troubleshooting guide
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