Non HP diagnostics tools ....................................................................................................................................................................76
7. Status lights, blinking light codes, troubleshooting lights, and POST error messages ................................76
Status lights ..................................................................................................................................................................................................76
Blinking light codes..................................................................................................................................................................................77
POST error messages...........................................................................................................................................................................78
Resolve the issue............................................................................................................................................................................................................ 79
8. Hard reset............................................................................................................................................................................................................ 79
9. Soft reset (Default Settings)...................................................................................................................................................................80
10. Reseat cables and connections .......................................................................................................................................................80
11. Test with minimum configuration........................................................................................................................................................81
Essential hardware configuration.................................................................................................................................................81
Safe mode ..................................................................................................................................................................................................... 82
12. Test with verified working configuration (hardware or operating system)......................................................... 82
13. Replace the system board.....................................................................................................................................................................83
Verify solution....................................................................................................................................................................................................................83
Helpful Hints ..................................................................................................................................................................................................................................84
At startup..............................................................................................................................................................................................................................84
During operation .............................................................................................................................................................................................................84
Consulting with HP Service.....................................................................................................................................................................................85
Common issues and possible solutions...................................................................................................................................................................86
Power-on issues...............................................................................................................................................................................................................86
No power....................................................................................................................................................................................................................86
Intermittent power-on, shutdown, reboot...........................................................................................................................................88
AC adapter issue.................................................................................................................................................................................................89
Battery not recognized, not charging...................................................................................................................................................89
Battery discharges too fast......................................................................................................................................................................... 92
Burnt smell ............................................................................................................................................................................................................... 92
POST ........................................................................................................................................................................................................................................93
No video (with power) .......................................................................................................................................................................................93
Blinking lights..........................................................................................................................................................................................................94
Diagnostic error messages.........................................................................................................................................................................95
BIOS password .....................................................................................................................................................................................................95
Performance (OS)...........................................................................................................................................................................................................96
Intermittent shutdown......................................................................................................................................................................................96
Blue screen ..............................................................................................................................................................................................................98
Freeze at Windows Logo (hang or lockup).........................................................................................................................................99
Electromagnetic Interference (EMI).....................................................................................................................................................100
No wake up..............................................................................................................................................................................................................101
Unresponsive........................................................................................................................................................................................................102
Slow performance ............................................................................................................................................................................................103
HP Smart Adapter warning message.................................................................................................................................................103
Incorrect time and date ................................................................................................................................................................................104
Display..................................................................................................................................................................................................................................105
Display anomalies.............................................................................................................................................................................................105
Symptom ......................................................................................................................................................................................................105
Quick check................................................................................................................................................................................................106
HP PC Hardware Diagnostics (UEFI) for video test........................................................................................................106
Display assembly diagram..............................................................................................................................................................106
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