6. Storage
7. Mechanical
A single symptom can be listed under dierent 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 conict 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 7-3 Failure classication by boot-up sequence
on page 103 and Table 7-4 Failure classication by hardware devices and mechanical on page 104). This will
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 oered on certain
hardware congurations; therefore, a Bluetooth issue can be classied under “I/O Device” if needed.
Failure classication by boot-up sequence
Table 7-3 Failure classication by boot-up sequence
1. Power-on 2. POST 3. Performance
1. No Power on page 120
2. Intermittent power-on, shutdown,
reboot on page 122
a
3. AC adapter issue on page 123
4. Battery not recognized, not charging
on page 123
5. Battery discharges too fast
on page 125
6. Burnt smell on page 125
1. No video (with power)
on page 126
2. Blinking lights on page 127
3. Diagnostics error messages
on page 127
4. BIOS password on page 129
1.
Intermittent shutdown on page 130
a
2. Blue screen (BSOD) error on page 155
b
3. Freeze at Windows Logo (hang/lockup)
on page 133
4. Electromagnetic Interference (EMI)
on page 134
5. No wake up on page 135
6. Unresponsive on page 136
7. Slow performance on page 136
c
8. HP Smart Adapter warning message
on page 137
9. Incorrect time and date on page 137
a,b,c
similar symptoms
General troubleshooting steps 103
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