Maintenance and Service Guide

6. Storage
7. Mechanical
A single symptom can be listed under dierent 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 conict 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 8-3 Failure classication by boot-up sequence
on page 88 and Table 8-4 Failure classication by hardware devices and mechanical on page 89). 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 oered on certain
hardware congurations; therefore, a Bluetooth issue can be classied under “I/O Device” if needed.
Failure classication by boot-up sequence
Table 8-3 Failure classication by boot-up sequence
1. Power-on 2. POST 3. Performance
1. No Power on page 104
2. Intermittent power-on, shutdown,
reboot on page 106
a
3. AC adapter issue on page 108
4. Battery not recognized, not charging
on page 108
5. Battery discharges too fast
on page 110
6. Burnt smell on page 111
1. No video (with power)
on page 111
2. Blinking lights on page 112
3. Diagnostics error messages
on page 113
4. BIOS password on page 114
1.
Intermittent shutdown on page 115
a
2.
Blue screen (BSOD) error on page 140
b
3. Freeze at Windows Logo (hang/lockup)
on page 118
4. Electromagnetic Interference (EMI)
on page 119
5. No wake up on page 120
6. Unresponsive on page 121
7.
Slow performance on page 121
c
8. HP Smart Adapter warning message
on page 122
9. Incorrect time and date on page 122
a,b,c
similar symptoms
88 Chapter 8 Troubleshooting guide