● 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 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 (Failure classification by boot-up sequence on
page 97 and Failure classification by hardware devices on page 97). 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. No power on page 112
2. Intermittent shutdown on page
122
a
3. AC adapter issue on page 115
4. Battery not recognized, not
charging on page 115
5. Battery discharges too fast on
page 118
6. Burnt smell on page 118
1. No video (with power) on page
119
2. Blinking lights on page 120
3. Diagnostic error messages on
page 121
4. BIOS password on page 121
1. Intermittent power-on, shutdown,
reboot on page 114
a
2. Blue screen on page 124
b
3. Freeze at Windows Logo (hang or
lockup) on page 125
4. Electromagnetic Interference (EMI) on
page 126
5. No wake up on page 127
6. Unresponsive on page 128
7. Slow performance on page 129
c
8. HP Smart Adapter warning message
on page 129
9. Incorrect time and date on page 130
a,b,c
similar symptoms
Failure classification by hardware devices
To determine failure by device, use this table.
Failure classification by boot-up sequence
97
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