HP ZBook 14u G4 Maintenance And Service Manual page 9

Analyze the issue ............................................................................................................................... 81
5. Remove or uninstall recently added hardware, software .......................................... 81
6. HP Hardware Diagnostics and Tools ........................................................................... 82
7. Status lights, blinking light codes, troubleshooting lights, and POST error
messages ........................................................................................................................ 86
Resolve the issue ............................................................................................................................... 89
8. Hard reset .................................................................................................................... 89
9. Soft reset (Default Settings) ....................................................................................... 90
10. Reseat cables and connections ................................................................................ 90
11. Test with minimum configuration ............................................................................ 91
12. Test with verified working configuration (hardware and/or operating system) ..... 92
13. Replace the system board ........................................................................................ 92
Verify solution ................................................................................................................................... 93
Helpful Hints ........................................................................................................................................................ 93
At startup ........................................................................................................................................... 93
During operation ............................................................................................................................... 94
Consulting with HP Service ............................................................................................................... 94
Common issues and possible solutions .............................................................................................................. 95
Power-on issues ................................................................................................................................ 95
No Power ......................................................................................................................... 95
Intermittent power-on, shutdown, reboot ..................................................................... 97
AC adapter issue .............................................................................................................. 98
Battery not recognized, not charging ............................................................................. 98
Battery discharges too fast .......................................................................................... 100
Burnt smell .................................................................................................................... 101
POST ................................................................................................................................................ 101
No video (with power) ................................................................................................... 101
Blinking lights ............................................................................................................... 102
Remotely deploying BIOS and drivers .......................................................... 81
HP PC Hardware Diagnostics (UEFI) ............................................................. 82
HP Support Assistant (HPSA) ....................................................................... 84
HP BIOS Configuration Utility (BCU) ............................................................. 85
HP Image Diagnostic Tool ............................................................................. 85
HP Thermal Monitor ..................................................................................... 85
Non HP diagnostics tools ............................................................................. 85
Status lights .................................................................................................. 86
Blinking light codes ...................................................................................... 87
POST error messages ................................................................................... 87
Power Good (Troubleshooting) lights .......................................................... 88
Essential hardware configuration ................................................................ 91
Safe mode ..................................................................................................... 92
ix