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Items
The sections below are intended for authorized service providers/technicians.
POST
No video (with power)
Items
Symptoms
No video (black/blank image) but
●
have power
Light activity
●
●
No error messages
Fan noise
●
Hard drive light blinking and hard
●
drive noise
The sections below are intended for authorized service providers/technicians.
126 Chapter 7 Troubleshooting guide
Procedures
2.
Inspect for visual damage on AC adapter and battery. Test on a known working
computer to isolate issue. If issue follows AC adapter or battery, replace it.
3.
Inspect any sign of liquid spill on the computer (back of keyboard).
Further inspection on components
1.
Inspect further sources internally after disassembling chassis, such as burnt or
damaged components.
2.
If the issue persists, replace boards, AC adapter, and battery for safety concern
and report issues to HP.
Procedures
Possible causes
Failed display
Failed critical components (memory, hard drive, system board)
Loose connection
Recently added hardware
NOTE:
Assume 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
and/or applications may cause graphics driver conflict and result in loss of video.
3.
Perform hardware reset
(8. Hard reset on page
presented correctly on display screen when pressing F10.
4.
Test with external monitor via VGA port (or DisplayPort, HDMI, etc). 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
on page
105) and perform soft reset
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
If there is video on display, disconnect external display device, open the computer lid
●
and restart.
113) and verify that HP Logo is
(4. Update BIOS and drivers
(9. Soft reset (Default Settings) on page
Windows logo
+
P
for display switcher).
115) if
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Table of Contents
Troubleshooting
