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 turned on 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 (
Table 7-4 Failure classification by boot-up sequence
and
Table 7-5 Failure classification by hardware devices on page 71
). This record helps isolate
the issue and indicate the next steps. For example, when the computer is running the operating system, it
can 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, you can classify a Bluetooth issue under I/O Device if needed.
Failure classification by boot-up sequence
Use this table to locate failure classification information.
Table 7-4
Failure classification by boot-up sequence
1. Power-on
2. POST
3. Performance
1.
2.
Intermittent power-on, shutdown,
reboot on page 87
3.
4.
Battery not recognized, not charging
5.
Battery discharges too fast on page
6.
1.
No video (with power) on page 91
2.
3.
4.
1.
Intermittent shutdown on page 94
2.
3.
Freeze at Windows Logo (hang or lockup)
4.
Electromagnetic Interference (EMI) on
5.
6.
7.
8.
HP Smart Adapter warning message on
9.
Incorrect time and date on page 102
a,b,c
similar symptoms
Failure classification by hardware devices
To determine failure by device, use this table.
Table 7-5
Failure classification by hardware devices
4. Display
5. I/O devices
6. Storage
7. Mechanical
1.
2.
3.
No video (internal) on
page 105
d
1.
2.
3.
1.
2.
1.
2.
3.
Failure classification by boot-up sequence
71