HP EliteBook 850 G4 Maintenance And Service Manual page 11

Mechanical ....................................................................................................................................... 138
Additional information ...................................................................................................................................... 142
Acronyms ......................................................................................................................................... 142
Blinking lights and boot error codes ............................................................................................... 143
POST Error Messages and User Actions .......................................................................................... 145
Routine Maintenance for Performance Improvement .................................................................... 147
Common Blue Screen Error Messages ............................................................................................ 147
Use Windows Debugging Tool ......................................................................................................... 148
Display Issue: Pixel Anomalies ........................................................................................................ 153
Cable management ......................................................................................................................... 154
Connector types .............................................................................................................................. 155
9 Computer Setup (BIOS), TPM, and HP Sure Start ........................................................................................... 157
Using Computer Setup ....................................................................................................................................... 157
Starting Computer Setup ................................................................................................................ 157
Navigating and selecting in Computer Setup ................................................................................. 157
Restoring factory settings in Computer Setup ............................................................................... 157
Updating the BIOS ........................................................................................................................... 158
Read-write error ........................................................................................................... 136
Slow performance ......................................................................................................... 136
Blue screen (BSOD) error .............................................................................................. 136
Noisy hard drive ............................................................................................................ 137
Fan error message - 90B .............................................................................................. 138
Noise (sound) ................................................................................................................ 139
Fan runs constantly ...................................................................................................... 140
Thermal shutdown (hot) ............................................................................................... 141
Stuck power button ...................................................................................................... 141
Processor not executing code ...................................................................................... 143
BIOS recovery code unable to find valid BIOS recovery image ..................................... 143
Memory module error ................................................................................................... 143
Graphics Controller Error (No Controller) ..................................................................... 144
Failure - System Board Error ........................................................................................ 144
Intel Trusted Execution Technology (TXT) Error .......................................................... 144
Sure Start unable to find valid BIOS Boot Block image ................................................ 144
Sure Start has identified a problem (Manual Recovery Policy Set) .............................. 145
Error message list ......................................................................................................... 147
Bug check symbolic names ........................................................................................... 147
Microsoft general troubleshooting of Windows bug check codes ............................... 148
Windows Software Development Kit (SDK) .................................................................. 149
Determining the BIOS version ...................................................................................... 158
Downloading a BIOS update ......................................................................................... 159
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