HP ZBook x2 Manual page 71

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
and Table 6-4 Failure classification by hardware devices and mechanical on page
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 6-3 Failure classification by boot-up sequence
1. Power-on
1. No Power on page 77
2. Intermittent power-on, shutdown,
reboot on page 79
3. AC adapter issue on page 80
4. Battery not recognized, not charging
on page 81
5. Battery discharges too fast
on page 82
6. Burnt smell on page 83
a,b,c similar symptoms
2. POST
1. No video (with power) on page 84
2. Blinking lights on page 85
a
3. Diagnostics error messages
on page 86
4. BIOS password on page 87
(Table 6-3 Failure classification by boot-up sequence on page 61
62). This will help isolate the
3. Performance
1. Intermittent shutdown on page 88
2. Blue screen (BSOD) error on page 114
3. Freeze at Windows Logo (hang/lockup)
on page 92
4. Electromagnetic Interference (EMI)
on page 93
5. No wake up on page 93
6. Unresponsive on page 95
7. Slow performance on page 95
8. HP Smart Adapter warning message
on page 96
9. Incorrect time and date on page 97
General troubleshooting steps
a
b
c
61