Maintenance and Service Guide

7. Status lights, blinking light codes, troubleshooting lights, and POST error
messages ........................................................................................................................ 83
Status lights .................................................................................................. 83
Blinking light codes ...................................................................................... 84
POST error messages ................................................................................... 84
Resolve the issue ............................................................................................................................... 85
8. Hard reset .................................................................................................................... 85
9. Soft reset (Default Settings) ....................................................................................... 86
10. Reseat cables and connections ................................................................................ 86
11. Test with minimum conguration ............................................................................ 87
Essential hardware conguration ................................................................ 87
Safe mode ..................................................................................................... 88
12. Test with veried working conguration (hardware and/or operating system) ..... 88
13. Replace the system board ........................................................................................ 88
Verify solution ................................................................................................................................... 89
Helpful Hints ........................................................................................................................................................ 89
At startup ........................................................................................................................................... 89
During operation ............................................................................................................................... 90
Consulting with HP Service ............................................................................................................... 91
Common issues and possible solutions .............................................................................................................. 91
Power-on issues ................................................................................................................................ 91
No Power ......................................................................................................................... 91
Intermittent power-on, shutdown, reboot ..................................................................... 93
AC adapter issue .............................................................................................................. 94
Battery not recognized, not charging ............................................................................. 94
Battery discharges too fast ............................................................................................ 96
Burnt smell ...................................................................................................................... 96
POST .................................................................................................................................................. 97
No video (with power) ..................................................................................................... 97
Blinking lights ................................................................................................................. 98
Diagnostics error messages ........................................................................................... 98
BIOS password .............................................................................................................. 100
Performance (OS) ............................................................................................................................ 100
Intermittent shutdown ................................................................................................. 101
Blue screen .................................................................................................................... 102
Freeze at Windows Logo (hang/lockup) ....................................................................... 104
Electromagnetic Interference (EMI) .............................................................................. 105
No wake up .................................................................................................................... 106
Unresponsive ................................................................................................................ 107
Slow performance ......................................................................................................... 107
HP Smart Adapter warning message ........................................................................... 108
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