13. Replace the system board .........................................................................................................................82
Verify solution..........................................................................................................................................................83
Helpful Hints ....................................................................................................................................................................83
At startup .................................................................................................................................................................83
During operation......................................................................................................................................................83
Consulting with HP Service ......................................................................................................................................84
Power-on issues.......................................................................................................................................................85
No power ..........................................................................................................................................................85
AC adapter issue...............................................................................................................................................88
Battery discharges too fast .............................................................................................................................90
Burnt smell.......................................................................................................................................................91
POST.........................................................................................................................................................................91
No video (with power) ......................................................................................................................................91
Blinking lights ..................................................................................................................................................92
Diagnostic error messages ..............................................................................................................................93
BIOS password .................................................................................................................................................93
Performance (OS).....................................................................................................................................................94
Intermittent shutdown ....................................................................................................................................94
Blue screen.......................................................................................................................................................96
No wake up.......................................................................................................................................................99
Unresponsive .................................................................................................................................................100
Slow performance..........................................................................................................................................101
Incorrect time and date..................................................................................................................................102
Display....................................................................................................................................................................102
Display anomalies..........................................................................................................................................102
Symptom................................................................................................................................................103
Quick check ............................................................................................................................................103
Display assembly diagram.....................................................................................................................104
Dead pixel.......................................................................................................................................................105
No video (internal) .........................................................................................................................................105
No video (external) ........................................................................................................................................105
DisplayPort/VGA ............................................................................................................................................106
HDMI ...............................................................................................................................................................106
Touch screen ..................................................................................................................................................108
I/O devices..............................................................................................................................................................109
Keyboard ........................................................................................................................................................109
Keyboard backlight ........................................................................................................................................111
Touchpad........................................................................................................................................................111
WWAN.............................................................................................................................................................113
USB .................................................................................................................................................................113
Smart card reader ..........................................................................................................................................114
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