HP ProBook 630 Maintenance and Service Guide - Page 73

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

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● External USB keyboard ● External mouse NOTE: After you remove the service door, disconnect all connections (internal keyboard, display, discrete GPU, hard drive or solid-state drive, daughterboards, and so on) to achieve the essential hardware configuration. Do not disassemble the system board from its enclosure at this time. Reverse the previous procedure by reinstalling each piece of hardware removed, one piece at a time, and testing your computer after each installation. Because your computer works with only the essential hardware 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 55 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 52, 7. Status lights, blinking light codes, troubleshooting lights, and POST error messages on page 55, 8. Hard reset on page 58, and 9. Soft reset (Default Settings) on page 59, or 10. Reseat cables and connections on page 59 can resolve many system board issues without requiring the effort of replacing unnecessary hardware. Review Table 7-2 Troubleshooting methodology and general troubleshooting steps on page 49 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. General troubleshooting steps 61

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●
External USB keyboard
●
External mouse
NOTE:
After you remove the service door, disconnect all connections (internal keyboard, display, discrete
GPU, hard drive or solid-state drive, daughterboards, and so on) to achieve the essential hardware
configuration.
Do not
disassemble the system board from its enclosure at this time.
Reverse the previous procedure by reinstalling each piece of hardware removed, one piece at a time, and
testing your computer after each installation. Because your computer works with only the essential hardware
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:
●
us-en/document/c01835750
●
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
55
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
52
,
7. Status lights, blinking light codes, troubleshooting lights, and POST error messages
on page
55
,
8. Hard reset
on page
58
, and
9. Soft reset (Default Settings)
on page
59
, or
10. Reseat cables and
connections
on page
59
can resolve many system board issues without requiring the effort of replacing
unnecessary hardware.
Review
Table
7
-
2
Troubleshooting methodology and general troubleshooting steps
on page
49
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.
General troubleshooting steps
61