Maintenance and Service Guide

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 7-3 Failure classication by boot-up sequence
on page 76 and Table 7-4 Failure classication by hardware devices and mechanical on page 77). 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 7-3 Failure classication by boot-up sequence
1. Power-on 2. POST 3. Performance
1. No Power on page 91
2. Intermittent power-on, shutdown,
reboot on page 93
a
3. AC adapter issue on page 94
4. Battery not recognized, not charging
on page 94
5. Battery discharges too fast
on page 96
6. Burnt smell on page 96
1. No video (with power)
on page 97
2. Blinking lights on page 98
3. Diagnostics error messages
on page 98
4. BIOS password on page 100
1.
Intermittent shutdown on page 101
a
2.
Blue screen (BSOD) error on page 125
b
3. Freeze at Windows Logo (hang/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 107
c
8. HP Smart Adapter warning message
on page 108
a,b,c
similar symptoms
76 Chapter 7 Troubleshooting guide