Maintenance and Service Guide

Failure classication by hardware devices and mechanical
Table 8-5 Failure classication by hardware devices and mechanical
4. Display 5. I/O devices 6. Storage 7. Mechanical
1. Display anomalies
on page 113
2. Dead pixel on page 115
3. No video (internal)
on page 115
d
4. No video (external)
on page 116
d
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
1. Keyboard on page 119
2. Keyboard point stick
on page 120
3. Keyboard backlight
on page 120
4. Touchpad on page 121
5. Network Connectivity
Ethernet (RJ-45 jack)
on page 121
6. Network connectivity
wireless (WLAN)
on page 121
7. WWAN on page 122
8. USB on page 122
9. Smart card reader
on page 124
10. Speaker, headphone -
audio issues on page 125
11. Thunderbolt (TB)
on page 126
1. Hard drive/solid-state
drive not recognized
on page 128
2. No boot to operating
system (no read/write
error) on page 128
3. Read-write error
on page 129
4. Slow performance
on page 111
c
5. Blue screen (BSOD) error
on page 129
b
6. Noisy hard drive
on page 130
1. Fan error message - 90B
on page 131
2. Noise (sound)
on page 132
3. Fan runs constantly
on page 133
4. HP Thermal Monitor
on page 86
5. Stuck power button
on page 134
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.
● Conrm that power sources are good, such as wall power type/adapter (110 V/220 V ac), power strip.
Test with a veried working AC outlet.
● Check for compatibility issues between the computer and third-party devices, peripherals, noncertied
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, oor mats, fans (and other electronic motors). EMI may contribute to a display freeze issue or
lock-up.
82 Chapter 8 Troubleshooting guide