HP Elite Dragonfly 13.5 Maintenance and Service Guide - Page 79

Test with minimum configuration, Essential hardware configuration, External USB keyboard

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● Reseating the daughterboards can resolve their functional issues. Some models may have items such as a power button board, VGA board, and others. ● Reseating graphics cables and panel connectors can fix distorted or flickering video. ● Replacing thermal pads may resolve thermal power-down issue. 11. Test with minimum configuration The factory-shipped computer (hardware configuration and preinstalled operating system image) is well tested and ready for use. Therefore, using the original factory hardware configuration or booting to operating system safe mode often resolves issues quickly. ● Disconnect any external USB storage, remove any discs in optical drives, remove the computer from a docking station, remove external video, and others. ● In addition to removing recently added components, you can narrow the issue down further with a minimum configuration. For example, if HP PC Diagnostics reports a memory error, test one memory module at a time to isolate the defective module. ● If the computer does not successfully boot the operating system, booting to safe mode may help identify the following possible causes of the issue. Essential hardware configuration If none of the previous steps resolve the issue, start the computer with essential hardware only. The purpose is to remove as much as hardware as possible while still maintaining the computer's ability to turn on. NOTE: This step is to be used by authorized service providers only. HP will not honor the warranty for a system tested with the system board removed without the heat sink or fan. This essential configuration is often used to troubleshoot power-on related issues, such as no-boot, reboot, and freezing issues. The essential hardware consists of the following components: ● System board ● AC adapter (unplug nonremovable battery or remove battery) ● Processor (and heat sink or fan). (Processor may be integrated into the system board.) ● Memory (one verified working memory DIMM) ● Graphics card (if no VGA port is available on the system board). Platform may have both Intel integrated graphics and discrete graphics. Therefore, you might not need a discrete graphics card. ● External VGA monitor ● 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 70 Chapter 6 Troubleshooting guide

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●
Reseating the daughterboards can resolve their functional issues. Some models may have items such as a
power button board, VGA board, and others.
●
Reseating graphics cables and panel connectors can fix distorted or flickering video.
●
Replacing thermal pads may resolve thermal power-down issue.
11. Test with minimum configuration
The factory-shipped computer (hardware configuration and preinstalled operating system image) is well
tested and ready for use. Therefore, using the original factory hardware configuration or booting to operating
system safe mode often resolves issues quickly.
●
Disconnect any external USB storage, remove any discs in optical drives, remove the computer from a
docking station, remove external video, and others.
●
In addition to removing recently added components, you can narrow the issue down further with a
minimum configuration. For example, if HP PC Diagnostics reports a memory error, test one memory
module at a time to isolate the defective module.
●
If the computer does not successfully boot the operating system, booting to safe mode may help identify
the following possible causes of the issue.
Essential hardware configuration
If none of the previous steps resolve the issue, start the computer with essential hardware only. The purpose
is to remove as much as hardware as possible while still maintaining the computer’s ability to turn on.
NOTE:
This step is to be used by authorized service providers only. HP will not honor the warranty for a
system tested with the system board removed without the heat sink or fan.
This essential configuration is often used to troubleshoot power-on related issues, such as no-boot, reboot,
and freezing issues.
The essential hardware consists of the following components:
●
System board
●
AC adapter (unplug nonremovable battery or remove battery)
●
Processor (and heat sink or fan). (Processor may be integrated into the system board.)
●
Memory (one verified working memory DIMM)
●
Graphics card (if no VGA port is available on the system board). Platform may have both Intel integrated
graphics and discrete graphics. Therefore, you might not need a discrete graphics card.
●
External VGA monitor
●
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
70
Chapter 6
Troubleshooting guide