Examine The Environment - HP zbook 15 G3 Maintenance And Service Manual

Failure classification by hardware devices and mechanical
Table 7-4 Failure classification by hardware devices and mechanical
4. Display
1. Display anomalies
on page 113
2. Dead pixel on page 115
3. No video (internal)
on page 115
4. No video (external)
on page 116
5. DisplayPort/VGA
on page 116
6. HDMI on page 116
7. No or bad external video
via docking on page 117
8. Incorrect or missing color/
distorted image
on page 117
9. Touch screen
on page 118
b,c,d similar symptoms

2. Examine the environment

It is important to examine the computer's environment. If you can quickly identify the cause of the issue,
fewer resolution steps may be needed. Perform the following environment inspections:
Check all cables and connections to be sure that there are no loose connections.
●
● Confirm that power sources are good, such as wall power type/adapter (110V/220V ac), power strip. Test
with a verified working AC outlet.
● Check for compatibility issues between the computer and third-party devices, peripherals, noncertified
devices, incompatible hardware (i.e., Mac OS device). Incompatibility can result in blue screen errors,
improper operation, and so on.
● Isolate the computer from sources of electromagnetic interference (EMI), such as cell phones, 2-way
radios, floor mats, fans (and other electronic motors). EMI may contribute to a display freeze issue or
lock-up.
80 Chapter 7 Troubleshooting guide
5. I/O devices
1. Keyboard on page 119
2. Keyboard point stick
on page 120
3. Keyboard backlight
on page 120
d
4. TouchPad on page 121
d
5. Network Connectivity
Ethernet (RJ-45 jack)
on page 121
6. Network connectivity
wireless (WLAN)
on page 122
7. WWAN on page 123
8. USB on page 124
9. Smart card reader
on page 125
10. Speaker, headphone -
audio issues on page 126
11. Thunderbolt (TB)
on page 127
6. Storage
1. Hard drive/solid-state
drive not recognized
on page 129
2. No boot to operating
system (no read/write
error) on page 129
3. Read-write error
on page 130
4. Slow performance
on page 111 c
5. Blue screen (BSOD) error
b
on page 130
6. Noisy hard drive
on page 131
7. Mechanical
1. Fan error message - 90B
on page 132
2. Noise (sound)
on page 133
3. Fan runs constantly
on page 134
4. HP Thermal Monitor
on page 85
5. Stuck power button
on page 135