● 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 76 and Failure classification by hardware devices on page 76). 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 91
2. Intermittent shutdown on page
101
a
3. AC adapter issue on page 94
4. Battery not recognized, not
charging on page 94
5. Battery discharges too fast on
page 97
6. Burnt smell on page 97
1. No video (with power) on page
98
2. Blinking lights on page 99
3. Diagnostic error messages on
page 100
4. BIOS password on page 100
1. Intermittent power-on, shutdown,
reboot on page 93
a
2. Blue screen on page 103
b
3. Freeze at Windows Logo (hang or
lockup) on page 104
4. Electromagnetic Interference (EMI) on
page 105
5. No wake up on page 106
6. Unresponsive on page 107
7. Slow performance on page 108
c
8. HP Smart Adapter warning message
on page 108
9. Incorrect time and date on page 109
a,b,c
similar symptoms
Failure classification by hardware devices
To determine failure by device, use this table.
76
Chapter 7 Troubleshooting guide
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