HP ZBook 14U G5 - Page 99

Table 4 categorizes failures by hardware.
4. Display
5. I/O devices (Input/Output)
6. Storage
7. Mechanical
A single symptom can be listed under dierent groups. For example, No Video can belong to (1) Power-on or
(4) Display; but Flickering when powered should be listed in (4) Display. Or, in another example, a blue screen
can be caused by a driver
conict in Performance (4), but it can also be caused by a defective hard drive under
(6) Storage. Therefore, failures that share similar symptoms are noted..
If possible, make a record of the failure symptom, the phase of the boot-up sequence where the failure
occurs, and the most likely location in the failure tree (Table 8-3 Failure classication by boot-up sequence
on page 87 and Table 8-4 Failure classication by hardware devices and mechanical on page 88). This will
help isolate the issue and indicate the next steps. For example, when the computer is running the operating
system, it may experience an issue with (4) Display, (5) I/O devices (keyboard, wireless, and so on), (6)
Storage, or (7) Mechanical components (stuck buttons, thermal shutdown, and so on).
NOTE: “Uncategorized” is used if an issue found is not listed. For example, Bluetooth is oered on certain
hardware congurations; therefore, a Bluetooth issue can be classied under “I/O Device” if needed.
Failure classication by boot-up sequence
Table
8-3 Failure classication by boot-up sequence
1. Power-on 2. POST 3. Performance
1. No Power on page 103
2. Intermittent power-on, shutdown,
reboot on page 105
a
3. AC adapter issue on page 107
4. Battery not recognized, not charging
on page 107
5. Battery discharges too fast
on page 109
6. Burnt smell on page 110
1. No video (with power)
on page 110
2. Blinking lights on page 111
3. Diagnostics error messages
on page 112
4. BIOS password on page 113
1.
Intermittent shutdown on page 114
a
2.
Blue screen (BSOD) error on page 139
b
3. Freeze at Windows Logo (hang/lockup)
on page 117
4. Electromagnetic Interference (EMI)
on page 118
5. No wake up on page 119
6. Unresponsive on page 120
7.
Slow performance on page 120
c
8. HP Smart Adapter warning message
on page 121
9. Incorrect time and date on page 121
a,b,c
similar symptoms
General troubleshooting steps 87