POST
Use the following sections to troubleshoot Power-on Self Test issues.
No video (with power)
Use this information to troubleshoot video issues.
Table 7-15 Issues, possible causes, and xes
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 conict and result in loss of video.
3. Perform hardware reset (8. Hard reset on page 115) 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 107), and perform soft reset (9. Soft reset (Default Settings) on page 116) 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.
132 Chapter 7 Troubleshooting guide ENWW
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