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For field replaceable units (FRUs), authorized service providers can try the following steps (for more
information, see the "Removal and replacement procedures for authorized service provider parts" chapter).
Reseating the fan cable can fix POST error 90B (no fan detected) issue (see
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User Actions on page
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Reseating the power cable can fix a no boot issue.
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Reseating the daughterboards (some models may have a power button board, VGA board, etc.) can
resolve their functional issues.
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Reseating graphics cables and panel connectors can fix distorted/flickering video.
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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 and/or booting to
operating system safe mode often resolves issues quickly.
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Disconnect any external USB storage, remove any discs in optical drives, remove the computer from a
docking station, remove external video, etc.
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In addition to removing recently added components, the issue can be narrowed 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 what may be causing the issue as described below.
Essential hardware configuration
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, fan, etc.
If none of the steps above 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.
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:
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System board
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AC adapter (unplug nonremovable battery or remove battery)
Processor (and heat sink/fan). (Processor may be integrated into the system board.)
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Memory (one verified 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
External mouse
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92
Chapter 7 Troubleshooting guide
144).
POST Error Messages and
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Troubleshooting
