HP EliteBook 850 G4 Maintenance And Service Manual page 10

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Diagnostics error messages ......................................................................................... 109
BIOS password .............................................................................................................. 110
Performance (OS) ............................................................................................................................ 110
Intermittent shutdown ................................................................................................. 111
Blue screen .................................................................................................................... 112
Freeze at Windows Logo (hang/lockup) ....................................................................... 114
Electromagnetic Interference (EMI) .............................................................................. 115
No wake up .................................................................................................................... 116
Unresponsive ................................................................................................................ 117
Slow performance ......................................................................................................... 117
HP Smart Adapter warning message ........................................................................... 118
Incorrect time and date ................................................................................................ 118
Display ............................................................................................................................................. 119
Display anomalies ......................................................................................................... 119
Symptom .................................................................................................... 119
Quick check ................................................................................................. 120
HP PC Hardware Diagnostics (UEFI) for video test ..................................... 120
Display assembly diagram ......................................................................... 121
Dead pixel ..................................................................................................................... 121
No video (internal) ........................................................................................................ 121
No video (external) ....................................................................................................... 122
DisplayPort/VGA ........................................................................................................... 122
HDMI .............................................................................................................................. 122
No or bad external video via docking ........................................................................... 123
Incorrect or missing color/distorted image .................................................................. 123
Touch screen ................................................................................................................. 124
I/O devices ....................................................................................................................................... 125
Keyboard ....................................................................................................................... 125
Keyboard point stick ..................................................................................................... 126
Keyboard backlight ....................................................................................................... 126
TouchPad ....................................................................................................................... 127
Network Connectivity Ethernet (RJ-45 jack) ................................................................ 127
Network connectivity wireless (WLAN) ........................................................................ 128
WWAN ............................................................................................................................ 129
USB ................................................................................................................................ 130
Smart card reader ......................................................................................................... 131
Speaker, headphone - audio issues .............................................................................. 132
Thunderbolt (TB) ........................................................................................................... 133
Storage ............................................................................................................................................ 134
Hard drive/solid-state drive not recognized ................................................................ 135
No boot to operating system (no read/write error) ..................................................... 135