HP ProBook 630 Maintenance and Service Guide - Page 62

Failure classification, display; but flickering when turned on should be listed in 4 display. Or

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It is important to understand where in the boot-up sequence the symptoms occur. The following table lists the phases of the boot-up sequence and explains the symptoms that may occur in each phase. For example, a blue screen error (BSOD) often occurs during the performance phase. Table 7-3 Boot-up sequence and associated failures Item Procedure Startup After you press the power button, the computer boots after all internal power rails (such as 5 V, 3.3 V) are stable. Confirm that power lights are on and fan is spinning. Common issues: all lights are off; troubleshooting lights are on; computer does not boot; video is absent. POST (UEFI/BIOS) Power-On Self-Test (POST) verifies that hardware components (such as processor, hard drive, memory) are functional. When POST is complete, the HP logo appears briefly and then disappears. If there are errors, the computer may exhibit blinking lights and POST error messages, and so on. Common issues: lights blink; error message appears; system hangs (lock up or freezes) Performance (operating system) System boots to operating system, and Windows logo screen appears. Common issues: hangs, blue screen, distorted video, driver conflict, slow performance, display issue (dead pixel), I/O issue (no speaker sound), wireless/audio unavailable, noise. See Analyze the issue on page 53 table for detailed troubleshooting information. Failure classification Failure classification is a breakdown of different types of failures and symptoms that could occur during the boot-up sequence. Table 7-4 Failure classification by boot-up sequence on page 51 and Table 7-5 Failure classification by hardware devices on page 51 represent the failure classification for common notebook failures. Table 7-4 Failure classification by boot-up sequence on page 51 categorizes failures by the boot-up sequence. 1. Power-on: Common issues are no power, recycle, or reboot. 2. POST: Common issues are no boot (despite power), light flash, or diagnostics error. 3. Performance: Common issues are Intermittent Loss of Power, Blue Screen, Hang. In many cases, issues can be identified and associated with particular hardware (for example, display or storage). Table 7-5 Failure classification by hardware devices on page 51 categorizes failures by hardware: ● Display ● I/O (input/output) devices ● Storage ● 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 (Table 7-4 Failure classification by boot-up sequence on page 51 and Table 7-5 Failure classification by hardware devices on page 51). This record helps isolate 50 Chapter 7 Troubleshooting guide

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It is important to understand where in the boot-up sequence the symptoms occur. The following table lists
the phases of the boot-up sequence and explains the symptoms that may occur in each phase. For example, a
blue screen error (BSOD) often occurs during the performance phase.
Table 7-3
Boot-up sequence and associated failures
Item
Procedure
Startup
After you press the power button, the computer boots after all internal power rails (such as 5 V, 3.3 V) are
stable.
Confirm that power lights are on and fan is spinning.
Common issues: all lights are off; troubleshooting lights are on; computer does not boot; video is absent.
POST (UEFI/BIOS)
Power-On Self-Test (POST) verifies that hardware components (such as processor, hard drive, memory) are
functional. When POST is complete, the HP logo appears briefly and then disappears.
If there are errors, the computer may exhibit blinking lights and POST error messages, and so on.
Common issues: lights blink; error message appears; system hangs (lock up or freezes)
Performance
(operating system)
System boots to operating system, and Windows logo screen appears.
Common issues: hangs, blue screen, distorted video, driver conflict, slow performance, display issue (dead
pixel), I/O issue (no speaker sound), wireless/audio unavailable, noise.
See
Analyze the issue
on page
53
table for detailed troubleshooting information.
Failure classification
Failure classification
is a breakdown of different types of failures and symptoms that could occur during the
boot-up sequence.
Table
7
-
4
Failure
classification
by boot-up sequence
on page
51
and
Table
7
-
5
Failure
classification
by
hardware devices
on page
51
represent the failure classification for common notebook failures.
Table
7
-
4
Failure
classification
by boot-up sequence
on page
51
categorizes failures by the boot-up
sequence.
1.
Power-on: Common issues are no power, recycle, or reboot.
2.
POST: Common issues are no boot (despite power), light flash, or diagnostics error.
3.
Performance: Common issues are Intermittent Loss of Power, Blue Screen, Hang. In many cases, issues
can be identified and associated with particular hardware (for example, display or storage).
Table
7
-
5
Failure
classification
by hardware devices
on page
51
categorizes failures by hardware:
●
Display
●
I/O (input/output) devices
●
Storage
●
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 (
Table
7
-
4
Failure
classification
by boot-up sequence
on page
51
and
Table
7
-
5
Failure
classification
by hardware devices
on page
51
). This record helps isolate
50
Chapter 7
Troubleshooting guide