Maintenance and Service Guide

Failure classication by hardware devices and mechanical
Table 7-4 Failure classication by hardware devices and mechanical
4. Display 5. I/O devices 6. Storage 7. Mechanical
1. Display anomalies
on page 108
2. Dead pixel on page 111
3. No video (internal)
on page 111
d
4. No video (external)
on page 112
d
5. DisplayPort/VGA
on page 112
6. HDMI on page 112
7. No or bad external video
via docking on page 113
8. Incorrect or missing color/
distorted image
on page 113
9. Touch screen
on page 114
1. Keyboard on page 115
2. Keyboard point stick
on page 116
3. Keyboard backlight
on page 116
4. TouchPad on page 117
5. Network Connectivity
Ethernet (RJ-45 jack)
on page 117
6. Network connectivity
wireless (WLAN)
on page 118
7. USB on page 119
8. Smart card reader
on page 120
9. Speaker, headphone -
audio issues on page 121
10. Thunderbolt (TB)
on page 122
1. Hard drive/solid-state
drive not recognized
on page 124
2. No boot to operating
system (no read/write
error) on page 124
3. Read-write error
on page 125
4. Slow performance
on page 107
c
5. Blue screen (BSOD) error
on page 125
b
6. Noisy hard drive
on page 126
1. Fan error message - 90B
on page 127
2. Noise (sound)
on page 128
3. Fan runs constantly
on page 129
4. HP Thermal Monitor
on page 82
5. Stuck power button
on page 130
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 (110V/220V 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.
General troubleshooting steps 77