HP ZBook 15 G3 Base Model Mobile Workstation User Manual download pdf (Page 109)

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Processor (and heat sink/fan). (Processor may be integrated into the system board.)

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Memory (one veried working memory DIMM)

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Graphics card (if no VGA port is available on the system board). Platform may have both Intel integrated

graphics and discrete graphics. Therefore, discrete graphics card may not be needed.

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External VGA monitor

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External USB keyboard

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External mouse

NOTE: After the service door is removed, disconnect all connections (internal keyboard, display, discrete

GPU, hard drive/solid-state drive, daughterboards, etc.) to achieve the essential hardware conguration

above. DO NOT disassemble the system board from its enclosure at this time.

Reverse the procedure above by reinstalling each piece of hardware removed, one piece at a time, and testing

your computer after each installation. Since 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 not work properly. By installing each device back into the computer and testing each time,

the failing hardware will eventually be identied.

Safe mode

A driver conict often results in a blue screen error message. Therefore, booting in safe mode can resolve

many issues in Windows because safe mode forces the computer to load a limited version of Windows which

only contains essential les. 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 links below for how to start your computer in safe mode:

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HP PCs – Windows 7 Safe Mode

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HP PCs – Windows Safe Mode (Windows 10, 8)

12. Test with veried working conguration (hardware and/or operating system)

One troubleshooting technique that can quickly isolate an issue is using a veried 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 veried working AC adapter can identify an error caused by a

faulty one. Similarly, testing with a veried working operating system can determine bad behaviors of the

current operating system. See Non HP diagnostics tools on page 89 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

The system board may be replaced only by authorized service providers. 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 85, 7. Status lights, blinking light codes, troubleshooting

lights, and POST error messages on page 90, 8. Hard reset on page 94, and 9. Soft reset (Default Settings)

on page 95, and/or 10. Reseat cables and connections on page 95 can resolve many system board issues

without requiring the eort of replacing unnecessary hardware.

Review Table 7-1 Troubleshooting methodology and general troubleshooting steps on page 81 for

appropriate troubleshooting steps.

General troubleshooting steps 97

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HP ZBook 15 G3 Base Model Mobile Workstation User Manual Page 109

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