HP EliteBook 850 G4 User Manual

4. Unplug the AC adapter from the computer.
5. Press and hold the power button for at least 15 seconds to drain residual power.
6. Reconnect the battery and plug the AC adapter back into the computer, but do not connect any of the
peripheral devices.
7. Press the power button to turn on the computer.
8. If a startup menu appears, use the arrow keys to select Start Windows Normally, and then press the
Enter key.
9. After reconnecting each of the peripheral devices, run Windows Update and HP Support Assistant to
update all device drivers.
Clear CMOS
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 it is necessary to
clear CMOS, which requires removing and reinserting the 3V RTC battery for a short period of 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.
The notebook service door must be removed to access the CMOS battery. See the RTC battery replacement
section for the battery removal/replacement.
9. Soft reset (Default Settings)
NOTE: Some company policies prohibit updates or changes. Check whether the computer has custom BIOS
settings before taking action.
If your computer is having issues booting, has errors during boot, is running into issues after adding
hardware, or you are having other abnormal system behaviors that cannot be resolved through any other
methods (i.e., hard reset), it may be necessary to reset the system BIOS to default settings.
To load BIOS to default settings: Reboot the computer, and then press F10 > Main > Restore defaults. For
more information, see the BIOS F10 Setup technical white paper at http://support.hp.com, enter your
computer model, and then go to Manuals > White papers > HP PC BIOS F10 Setup Guide.
10. Reseat cables and connections
NOTE: Before disassembling the computer to reseat cables and connections, always disconnect power and
remove the battery or disconnect a non removable battery.
Many problems are caused by improper connections or loose connections due to abnormal movement and
vibration. See Cable management on page 154 and Connector types on page 155 for suggested cable
management practices when removing and installing components.
You can access and reseat connections for Customer Self-Repair (CSR) parts (see the “Removal and
replacement procedures for Customer Self-Repair parts” chapter for details). 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 145).
96 Chapter 8 Troubleshooting guide

HP EliteBook 850 G4 Specifications

General

Form factor	Clamshell
Product type	Laptop
Product color	Silver
Country of origin	China
Bus type	OPI
Stepping	H0
Tjunction	100 °C
Processor cache	3 MB
Processor cores	2
Processor model	i5-7200U
System bus rate	4 GT/s
Processor family	Intel® Core™ i5
Processor socket	BGA 1356
Processor threads	4
Processor codename	Kaby Lake
Configurable TDP-up	25 W
Processor frequency	2.5 GHz
Processor cache type	Smart Cache
Configurable TDP-down	7.5 W
Processor lithography	14 nm
Processor manufacturer	Intel
PCI Express slots version	3.0
Processor boost frequency	3.1 GHz
Processor operating modes	64-bit
ECC supported by processor	No
PCI Express configurations	1x2+2x1, 1x4, 2x2, 4x1
Thermal Design Power (TDP)	15 W
Configurable TDP-up frequency	2.7 GHz
Configurable TDP-down frequency	0.8 GHz
Maximum number of PCI Express lanes	12
Numeric keypad	Yes
Pointing device	Touchpad
Memory slots	2x SO-DIMM
Internal memory	8 GB
Memory clock speed	2133 MHz
Internal memory type	DDR4-SDRAM
Maximum internal memory	32 GB
Memory layout (slots x size)	1 x 8 GB
SSD capacity	The Solid State Drive's storage capacity in Gigabytes.
SSD interface	PCI Express
Storage media	SSD
Total storage capacity	256 GB
Compatible memory cards	SD, SDHC, SDXC
Number of SSDs installed	1
Display diagonal	15.6 \
Native aspect ratio	16:9
On-board graphics card ID	0x5916
Discrete graphics card model	Not available
On-board graphics card model	Intel® HD Graphics 620
On-board graphics card family	Intel® HD Graphics
On-board graphics card OpenGL version	4.4
On-board graphics card base frequency	300 MHz
On-board graphics card DirectX version	12.0
On-board graphics card dynamic frequency (max)	1000 MHz
Battery capacity	51 Wh
Battery life (max)	14.7 h
Number of battery cells	3
AC adapter power	45 W
Wi-Fi standards	802.11a, Wi-Fi 5 (802.11ac), 802.11b, 802.11g, Wi-Fi 4 (802.11n)
Bluetooth version	4.2
Top Wi-Fi standard	Wi-Fi 5 (802.11ac)
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Charging port type	DC-in jack
USB 2.0 ports quantity	0
Sustainability certificates	ENERGY STAR
Processor code	SR2ZU
Processor ARK ID	95443
Processor package size	42 x 24 mm
Supported instruction sets	AVX 2.0, SSE4.1, SSE4.2
Intel Identity Protection Technology version	1.00
Intel Stable Image Platform Program (SIPP) version	0.00
Intel segment tagging	Home Office, Small Business
HP segment	Business
HP Management tools	HP Driver Packs, HP SoftPaq Download Manager (SDM), HP System Software Manager (SSM), HP BIOS Config Utility (BCU), HP Client Catalog, HP Management Integration Kit, HP Device Access Manager, HP BIOSphere, HP Sure Start, HP Client Security
HP Software provided	HP ePrint Driver+JetAdvantage, HP Hotkey Support, HP Noise Cancellation, HP Workwise, HP Velocity
Harmonized System (HS) code	84713000

Weight and Dimensions

Depth	257.7 mm
Width	383.6 mm
Height	19.4 mm
Weight	1840 g

Summary

Illustrated Parts Catalog

Removal and Replacement Preliminary Requirements

Tools and Service Considerations

Lists necessary tools and outlines important considerations before disassembly and assembly.

Grounding Guidelines

Provides instructions on how to prevent electrostatic discharge damage.

Customer Self-Repair Procedures

Component Replacement Procedures Overview

Details steps for removing and replacing various user-serviceable computer components.

Bottom Cover Replacement

Details the steps for removing and replacing the computer's bottom cover.

Battery Replacement

Storage Drive Replacement (HDD/SSD)

Memory Module Replacement

Keyboard Replacement

Authorized Service Provider Procedures

Component Replacement Procedures Overview (Authorized)

Details steps for removing and replacing components accessible only by authorized providers.

Internal Base Plate Replacement

Heat Sink/Fan Assembly Replacement

System Board Replacement

Display Assembly Replacement

Top Cover Replacement

Interpreting Diagnostic LEDs and Audible Codes

Blinking Lights and Boot Error Codes

Troubleshooting Guide

General Troubleshooting Methodology

Provides a systematic approach to diagnosing and resolving computer issues.

Identifying and Analyzing Issues

HP Diagnostic Tools and Resources

Introduces HP diagnostic tools and other resources for hardware failure analysis.

Issue Resolution Steps

Provides methods for resolving identified computer issues, including resets and configuration changes.

Computer Setup (BIOS) and Configuration

Using Computer Setup (BIOS)

Updating the BIOS

Provides instructions on how to update the computer's BIOS.

Using HP PC Hardware Diagnostics (UEFI)

Download UEFI Diagnostics to USB

Explains how to download and create a bootable USB for HP PC Hardware Diagnostics.

Backup and Recovery Procedures

Creating Recovery Media and Backups

Restore and Recovery Options

Provides options for restoring, refreshing, and resetting the computer.

Recovering with HP Recovery Manager