HP ZBook 15u G5 Maintenance And Service Manual page 100

6. Storage
7. Mechanical
A single symptom can be listed under different 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 conflict 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
on page 88
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 offered on certain
hardware configurations; therefore, a Bluetooth issue can be classified under "I/O Device" if needed.
Failure classification by boot-up sequence
Table 8-3 Failure classification by boot-up sequence
1. Power-on
1. No Power on page 104
2. Intermittent power-on, shutdown,
reboot on page 106
3. AC adapter issue on page 108
4. Battery not recognized, not charging
on page 108
5. Battery discharges too fast
on page 110
6. Burnt smell on page 111
a,b,c similar symptoms
88 Chapter 8 Troubleshooting guide
and Table 8-4 Failure classification by hardware devices and mechanical on page
a
(Table 8-3 Failure classification by boot-up sequence
2. POST
1. No video (with power)
on page 111
2. Blinking lights on page 112
3. Diagnostics error messages
on page 113
4. BIOS password on page 114
89). This will
3. Performance
1.
Intermittent shutdown on page 115
2. Blue screen (BSOD) error on page 140
3. Freeze at Windows Logo (hang/lockup)
on page 118
4. Electromagnetic Interference (EMI)
on page 119
5. No wake up on page 120
6. Unresponsive on page 121
7. Slow performance on page 121
8. HP Smart Adapter warning message
on page 122
9. Incorrect time and date on page 122
a
b
c