HP Elite Dragonfly 13.5 Maintenance and Service Guide - Page 78

Soft reset (Default Settings), 10. Reseat cables and connections

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10. After reconnecting each of the peripheral devices, run Windows Update and HP Support Assistant to update all device drivers. CMOS refers to the battery-powered semiconductor chip located on computer's system board. Notebooks store low-level settings like the system time and hardware settings in CMOS. Sometimes you must clear CMOS, which requires removing and reinserting the 3 V RTC battery for a short time (a few minutes before reinserting), in addition to removing the AC adapter and battery. NOTE: Clearing the CMOS should only be performed for troubleshooting purposes. There is no reason to clear CMOS if the computer is working properly. You must remove the notebook service door to access the CMOS battery. If the computer has a replaceable RTC battery, see the RTC battery replacement section for the battery removal or replacement. 9. Soft reset (Default Settings) If your computer has issues booting, has errors during boot, has issues after you add hardware, or has other abnormal system behaviors that you cannot resolve through any other methods (for example, hard reset), it may be necessary to reset the system BIOS to default settings. NOTE: Some company policies prohibit updates or changes. Check whether the computer has custom BIOS settings before taking action. To load BIOS to default settings: Reboot the computer, and then press f10 > Main > Restore defaults. For more information, see http://support.hp.com, and the search for BIOS Setup Utility Information and Menu Options. 10. Reseat cables and connections Many problems are caused by improper connections or loose connections because of abnormal movement and vibration. NOTE: Before disassembling the computer to reseat cables and connections, always disconnect power and remove the battery, or disconnect a nonremovable battery. See Cable management on page 125 and Connector types on page 126 for suggested cable management practices when you remove and install components. You can access and reseat connections for Customer Self-Repair (CSR) parts. Examples of reseating hardware include: ● Reseating the battery into the battery bay can resolve no-battery found and no-charging issues. ● Reseating memory modules can resolve memory error, no-boot, and blue screen issues. ● Reseating the hard drive can resolve a POST error 3F0 (no boot device) issue (see POST error messages and user actions on page 116). ● Reseating the keyboard cable can resolve an unrecognized keys error. ● Reseating the wireless module and antenna cable can resolve a wireless connection issue. For field replaceable units (FRUs), authorized service providers can try the following steps. For more information, see Removal and replacement procedures for authorized service provider parts on page 38. ● Reseating the fan cable can fix POST error 90B (no fan detected) issue (see POST error messages and user actions on page 116). ● Reseating the power cable can fix a no-boot issue. 9. Soft reset (Default Settings) 69

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10.
After reconnecting each of the peripheral devices, run Windows Update and HP Support Assistant to
update all device drivers.
CMOS refers to the battery-powered semiconductor chip located on computer's system board. Notebooks
store low-level settings like the system time and hardware settings in CMOS. Sometimes you must clear
CMOS, which requires removing and reinserting the 3 V RTC battery for a short time (a few minutes before
reinserting), in addition to removing the AC adapter and battery.
NOTE:
Clearing the CMOS should only be performed for troubleshooting purposes. There is no reason to
clear CMOS if the computer is working properly.
You must remove the notebook service door to access the CMOS battery. If the computer has a replaceable
RTC battery, see the RTC battery replacement section for the battery removal or replacement.
9. Soft reset (Default Settings)
If your computer has issues booting, has errors during boot, has issues after you add hardware, or has other
abnormal system behaviors that you cannot resolve through any other methods (for example, hard reset), it
may be necessary to reset the system BIOS to default settings.
NOTE:
Some company policies prohibit updates or changes. Check whether the computer has custom BIOS
settings before taking action.
To load BIOS to default settings: Reboot the computer, and then press
f10 > Main > Restore defaults
. For more
information, see
, and the search for
BIOS Setup Utility Information and Menu Options
.
10. Reseat cables and connections
Many problems are caused by improper connections or loose connections because of abnormal movement
and vibration.
NOTE:
Before disassembling the computer to reseat cables and connections, always disconnect power and
remove the battery, or disconnect a nonremovable battery.
See
Cable management
on page
125
and
Connector types
on page
126
for suggested cable management
practices when you remove and install components.
You can access and reseat connections for Customer Self-Repair (CSR) parts. Examples of reseating hardware
include:
●
Reseating the battery into the battery bay can resolve no-battery found and no-charging issues.
●
Reseating memory modules can resolve memory error, no-boot, and blue screen issues.
●
Reseating the hard drive can resolve a POST error 3F0 (no boot device) issue (see
POST error messages
and user actions
on page
116
).
●
Reseating the keyboard cable can resolve an unrecognized keys error.
●
Reseating the wireless module and antenna cable can resolve a wireless connection issue.
For field replaceable units (FRUs), authorized service providers can try the following steps. For more
information, see
Removal and replacement procedures for authorized service provider parts
on page
38
.
●
Reseating the fan cable can fix POST error 90B (no fan detected) issue (see
POST error messages and user
actions
on page
116
).
●
Reseating the power cable can fix a no-boot issue.
9. Soft reset (Default Settings)
69