HP ZBook Studio G4 Maintenance And Service Manual page 9

Resolve the issue ............................................................................................................................... 78
8. Hard reset .................................................................................................................... 78
9. Soft reset (Default Settings) ....................................................................................... 80
10. Reseat cables and connections ................................................................................ 80
11. Test with minimum configuration ............................................................................ 80
12. Test with verified working configuration (hardware and/or operating system) ..... 82
13. Replace the system board ........................................................................................ 82
Verify solution ................................................................................................................................... 83
Helpful Hints ........................................................................................................................................................ 83
At startup ........................................................................................................................................... 83
During operation ............................................................................................................................... 83
Consulting with HP Service ............................................................................................................... 84
Common issues and possible solutions .............................................................................................................. 85
Power-on issues ................................................................................................................................ 85
No Power ......................................................................................................................... 85
Intermittent power-on, shutdown, reboot ..................................................................... 87
AC adapter issue .............................................................................................................. 88
Battery not recognized, not charging ............................................................................. 88
Battery discharges too fast ............................................................................................ 90
Burnt smell ...................................................................................................................... 91
POST .................................................................................................................................................. 91
No video (with power) ..................................................................................................... 91
Blinking lights ................................................................................................................. 92
Diagnostics error messages ........................................................................................... 93
BIOS password ................................................................................................................ 94
Performance (OS) .............................................................................................................................. 94
Intermittent shutdown ................................................................................................... 95
Blue screen ...................................................................................................................... 96
Freeze at Windows Logo (hang/lockup) ......................................................................... 98
Electromagnetic Interference (EMI) ................................................................................ 99
No wake up .................................................................................................................... 100
Unresponsive ................................................................................................................ 101
Slow performance ......................................................................................................... 101
HP Smart Adapter warning message ........................................................................... 102
Status lights .................................................................................................. 73
Interpreting system validation diagnostic front panel LEDs and
audible codes ................................................................................................ 74
POST error messages ................................................................................... 75
Power Good (Troubleshooting) lights .......................................................... 77
Essential hardware configuration ................................................................ 81
Safe mode ..................................................................................................... 81
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