HP ZBook 15 G5 Base Model Mobile Workstation User Manual Page 126
- Page / 203
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Items Procedures
Lights blink on keyboard caps
lock/num lock keys
Blinking lights on startup usually indicate a problem with basic functionality of a critical
component (processor, BIOS, graphics cards, memory, etc.) due to loose connection,
defective parts, or recently added parts.
Troubleshooting steps
1. Check for any blink patterns. Count the number of blinks in a sequence, followed by a
pause for a few seconds.
2. See Status, Blinking Lights, and Error Message (7. Status lights, blinking light codes,
troubleshooting lights, and POST error messages on page 96) for corrective actions.
3. If internal hardware components (memory, hard drive, etc.) have been recently added, a
component may not be connected properly. Remove and reseat new components (10.
Reseat cables and connections on page 102) one at a time.
Note Since the display may not be functional, lights are used to indicate an error.
Diagnostics error messages
Items Procedures
Symptoms
● Computer has power
● POST error message displays
(Windows logo has not yet
appeared)
Possible causes
Diagnostic error messages indicate a problem. There may be a problem with the instruction
being sent from the BIOS to a hardware component (e.g., keyboard failures), or
incompatible hardware. Can usually be resolved by installing updated rmware for the
component.
Troubleshooting steps
1. See 7. Status lights, blinking light codes, troubleshooting lights, and POST error
messages on page 96 for corrective actions. An example of a POST error message is
shown below.
2. If there is power, you may be able to access BIOS. Reset BIOS to its default condition.
(9. Soft reset (Default Settings) on page 101)
3. Restore hardware to its original condition (i.e., bootable solid-state drive instead of
hard drive).
4. Reseat suspected components and verify connection.
5. Test suspected components using HP PC Hardware Diagnostics (UEFI) tool.
Note An Error Message means the system has nished BIOS hardware validation and is ready to
launch the Startup Menu. To access the Startup Menu for further options, press the Esc key
while restarting the computer.
114 Chapter 7 Troubleshooting guide
- Maintenance and Service Guide 1
- Safety warning notice 3
- Table of contents 5
- 1 Product description 13
- 2 Components 20
- 10 Chapter 2 Components 22
- 12 Chapter 2 Components 24
- Keyboard area 25
- 14 Chapter 2 Components 26
- Keyboard area 15 27
- 16 Chapter 2 Components 28
- Keyboard area 17 29
- Special keys 30
- Action keys 31
- 20 Chapter 2 Components 32
- To use a hot key: 33
- Keyboard area 21 33
- 22 Chapter 2 Components 34
- Cover 23 35
- Labels 25 37
- 3 Illustrated parts catalog 38
- Computer major components 27 39
- Bracket Kit 43
- Cable Kit 44
- Plastics Kit 45
- Mass storage devices 46
- Miscellaneous parts 47
- Component Spare part number 48
- Screw Kit L28720-001 48
- Tools required 49
- Service considerations 49
- Drive handling 50
- Workstation guidelines 51
- Equipment guidelines 52
- Customer Self-Repair parts 53
- Description Spare part number 55
- Solid-state drive (M.2) 56
- Hard drive 57
- WWAN module 59
- WLAN module 61
- Memory module 62
- Keyboard 65
- Bottom cover 67
- TouchPad module 69
- NFC module 72
- Heat sink assembly 76
- System board 78
- RTC battery 82
- Speakers 86
- Fingerprint reader board 87
- Power button board 89
- Display assembly 90
- 7 Troubleshooting guide 98
- Resources 99
- General troubleshooting steps 99
- Identify the issue 100
- 2. Examine the environment 102
- Analyze the issue 103
- Table 7-5 Boot-error codes 109
- Resolve the issue 112
- Verify solution 116
- Helpful Hints 117
- Power-on issues 118
- Consulting with HP Service 118
- AC adapter issue 121
- Battery discharges too fast 123
- Burnt smell 124
- No video (with power) 124
- Blinking lights 125
- Diagnostics error messages 126
- Performance (OS) 127
- Intermittent shutdown 128
- Blue screen 129
- No wake up 133
- Unresponsive 134
- Slow performance 134
- Incorrect time and date 135
- Display anomalies 136
- Dead pixel 137
- Vertical lines 137
- Horizontal lines 137
- No video (internal) 138
- No video (external) 139
- DisplayPort/VGA 139
- Touch screen 141
- I/O devices 142
- Keyboard point stick 143
- Keyboard backlight 143
- TouchPad 144
- Smart card reader 148
- Thunderbolt (TB) 150
- Read-write error 153
- Blue screen (BSOD) error 153
- Noisy hard drive 154
- Mechanical 155
- Noise (sound) 156
- Fan runs constantly 157
- Thermal shutdown (hot) 158
- Stuck power button 158
- Additional information 159
- Processor not executing code 160
- Memory module error 160
- Failure - System Board Error 161
- Additional information 151 163
- Error message list 164
- Bug check symbolic names 164
- Use Windows Debugging Tool 165
- 6. Open the crash dump le 168
- Lookup for Bug Check 0xC2 169
- Additional information 157 169
- Cable management 171
- Connector types 172
- Using Computer Setup 174
- Updating the BIOS 175
- Downloading a BIOS update 176
- Using Windows tools 179
- Restore and recovery 180
- (select products only) 184
- 11 Specications 186
- Hard drive specications 187
- 500 GB* 750 GB* 188
- Nonvolatile memory usage 195
- Questions and answers 197
- 14 Recycling 199
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