HP ZBook Studio 16 Maintenance and Service Guide - Page 83

Safe mode, 12. Test with verified working configuration (hardware or operating system)

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installed, those parts must be working properly. This means that one of the hardware components removed is causing the computer to fail. By installing each device back into the computer and testing each time, you eventually identify the failing hardware. Safe mode A driver conflict often results in a blue screen error message. Booting in safe mode can resolve many issues in Windows because safe mode forces the computer to load a limited version of Windows which contains only essential files. Safe mode is useful for troubleshooting problems with programs and drivers that might not start correctly or that might prevent Windows from starting correctly. If a problem does not reappear when you start in safe mode, eliminate the default settings and basic device drivers as possible causes. Refer to the following links for how to start your computer in safe mode: ● http://support.hp.com/us-en/document/c01835750 ● http://support.hp.com/us-en/document/c03439317 12. Test with verified working configuration (hardware or operating system) One troubleshooting technique that can quickly isolate an issue is using a verified working part while testing. A good example is to use an external keyboard, mouse, or VGA monitor when you have issues with an internal keyboard, touchpad, or display. Testing with a verified working AC adapter can identify an error caused by a faulty one. Similarly, testing with a verified working operating system can determine bad behaviors of the current operating system. See Non HP diagnostics tools on page 68 for instructions about obtaining and using a Windows-To-Go USB. NOTE: In some situations, more than one item may contribute to a problem. 13. Replace the system board Only authorized service providers may replace the system board. This should not be considered an initial step taken to resolve an issue. Review and perform all steps discussed previously before replacing the system board. 4. Update BIOS and drivers on page 65, 7. Status lights, blinking light codes, troubleshooting lights, and POST error messages on page 68, 8. Hard reset on page 71, and 9. Soft reset (Default Settings) on page 72, or 10. Reseat cables and connections on page 72 can resolve many system board issues without requiring the effort of replacing unnecessary hardware. Review Table 6-2 Troubleshooting methodology and general troubleshooting steps on page 61 for appropriate troubleshooting steps. IMPORTANT: System board failure is not common. Do not replace the system board until you have tried all other troubleshooting options. NOTE: Determine whether a previous service case might be related to the current problem. For example, a fan detection issue could be caused by a loose connection resulting from previous service. TIP: Without an RTC battery (3 V coin-cell battery), the computer automatically reboots. This feature is useful when the power connector cable (between external AC adapter and system board) is defective. NOTE: Most of the time, effective troubleshooting can prevent a system board replacement. Situations that can prevent resolution of the issue: 74 Chapter 6 Troubleshooting guide

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installed, those parts must be working properly. This means that one of the hardware components removed
is causing the computer to fail. By installing each device back into the computer and testing each time, you
eventually identify the failing hardware.
Safe mode
A driver conflict often results in a blue screen error message. Booting in safe mode can resolve many issues
in Windows because safe mode forces the computer to load a limited version of Windows which contains only
essential files.
Safe mode is useful for troubleshooting problems with programs and drivers that might not start correctly or
that might prevent Windows from starting correctly. If a problem does not reappear when you start in safe
mode, eliminate the default settings and basic device drivers as possible causes. Refer to the following links
for how to start your computer in safe mode:
●
●
12. Test with verified working configuration (hardware or operating system)
One troubleshooting technique that can quickly isolate an issue is using a verified working part while testing.
A good example is to use an external keyboard, mouse, or VGA monitor when you have issues with an internal
keyboard, touchpad, or display.
Testing with a verified working AC adapter can identify an error caused by a faulty one. Similarly, testing with a
verified working operating system can determine bad behaviors of the current operating system. See
Non HP
diagnostics tools
on page
68
for instructions about obtaining and using a Windows-To-Go USB.
NOTE:
In some situations, more than one item may contribute to a problem.
13. Replace the system board
Only authorized service providers may replace the system board. This should not be considered an initial step
taken to resolve an issue.
Review and perform all steps discussed previously before replacing the system board.
4. Update BIOS and
drivers
on page
65
,
7. Status lights, blinking light codes, troubleshooting lights, and POST error messages
on page
68
,
8. Hard reset
on page
71
, and
9. Soft reset (Default Settings)
on page
72
, or
10. Reseat cables
and connections
on page
72
can resolve many system board issues without requiring the effort of replacing
unnecessary hardware.
Review
Table 6-2
Troubleshooting methodology and general troubleshooting steps
on page
61
for
appropriate troubleshooting steps.
IMPORTANT:
System board failure is not common. Do not replace the system board until you have tried all
other troubleshooting options.
NOTE:
Determine whether a previous service case might be related to the current problem. For example, a
fan detection issue could be caused by a loose connection resulting from previous service.
TIP:
Without an RTC battery (3 V coin-cell battery), the computer automatically reboots. This feature is
useful when the power connector cable (between external AC adapter and system board) is defective.
NOTE:
Most of the time, effective troubleshooting can prevent a system board replacement.
Situations that can prevent resolution of the issue:
74
Chapter 6
Troubleshooting guide