Dell OptiPlex 5490 All-In-One

Questions and Answers

C
colleenhopkinsAug 18, 2025
Why is the power button on my Dell OptiPlex 5490 All-In-One solid amber and the system won't boot?
- S
  Sheryl BrightAug 18, 2025
  The power supply or another device in the system is failing. Replace the system board.
D
Denise MartinezAug 21, 2025
Why is the power button blinking white and my Dell OptiPlex 5490 All-In-One is unable to boot?
- P
  pattersonstevenAug 21, 2025
  The power supply is normal, but another device in the system is failing or not installed properly.
D
Douglas BlackAug 23, 2025
What to do if no memory or RAM is detected in my Dell OptiPlex 5490 All-In-One?
- W
  williamsjulieAug 23, 2025
  Check and confirm that the memory module is installed properly. If the problem continues, replace the memory module.
M
Michael PhelpsAug 26, 2025
What to do if there is a memory or RAM failure on my Dell Desktop?
- D
  Daniel RiveraAug 26, 2025
  Reset the memory module. If the problem continues, replace the memory module.
A
aaronsimsAug 28, 2025
How to fix System board BIOS or ROM failure on Dell OptiPlex 5490 All-In-One Desktop?
- A
  Amanda BowenAug 28, 2025
  Flash the latest BIOS version. If the problem continues, replace the system board.
A
ambersalinasAug 30, 2025
What to do if my Dell OptiPlex 5490 All-In-One has a display failure?
- K
  Kathryn HunterAug 30, 2025
  Flash the latest BIOS version. If the problem continues, replace the LCD module.
A
acampbellSep 1, 2025
How to resolve a system-board or chipset error on a Dell Desktop?
- J
  Joshua IrwinSep 1, 2025
  Flash the latest BIOS version. If the problem continues, replace the system board.
S
Stacie PrinceSep 3, 2025
What to do if the recovery image is not found on my Dell OptiPlex 5490 All-In-One Desktop?
- M
  melissa40Sep 4, 2025
  Flash the latest BIOS version. If the problem continues, replace the system board.
D
Daniel AtkinsonSep 6, 2025
What to do if invalid memory is installed on my Dell Desktop?
- M
  morrisnicholasSep 6, 2025
  Reset the memory module. If the problem continues, replace the memory module.
L
Lori Barnett DVMSep 8, 2025
What does it mean when the power status indicator blinks amber two times, then white three times on a Dell OptiPlex 5490 All-In-One Desktop?
- R
  Rebecca WallaceSep 8, 2025
  This indicates that the recovery image is not found. Flash the latest BIOS version. If the problem continues, replace the system board.

Summary

Safety Instructions

Before Working Inside Your Computer

Steps to take before performing any internal computer operations.

Safety Precautions

General safety measures to follow before and during disassembly/reassembly.

Electrostatic Discharge-ESD Protection

Measures to prevent damage from static electricity to electronic components.

ESD Field Service Kit

Details on the components and usage of an ESD field service kit.

Transporting Sensitive Components

Guidelines for safely transporting sensitive electronic parts.

After Working Inside Your Computer

Steps to follow after completing internal computer maintenance.

Removing and Installing Components

Recommended Tools

Lists the tools required for component removal and installation procedures.

Screw List

Details the types, quantities, and images of screws used in the system.

Stand

Procedures for removing and installing the fixed and height-adjustable stands.

Hard Drive

Step-by-step guide for removing and installing the computer's hard drive.

Memory Modules

Instructions for removing and installing RAM modules.

Solid-State Drive

Procedures for removing and installing M.2 NVMe solid-state drives.

Processor

Guide on safely removing and installing the CPU.

System Board

Detailed steps for removing and installing the main system board.

Software

Operating System

Lists the supported operating systems for the OptiPlex 5490.

Downloading the Drivers

Step-by-step guide to download and install drivers from Dell's support website.

System Setup

BIOS Overview

Explains the function of the BIOS in managing data flow and system operations.

Entering BIOS Setup Program

Instructions on how to access the BIOS setup utility by pressing F2 during startup.

Navigation Keys

Details the keyboard keys used to navigate and interact within the BIOS setup program.

Boot Sequence

How to bypass the default boot order and boot from a specific device.

System Setup Options

Overview of various configurable settings within the BIOS, categorized by function.

Clearing CMOS Settings

Procedure to reset BIOS settings to default by clearing CMOS.

Clearing BIOS (System Setup) and System Passwords

Information on how to clear system or BIOS passwords.

Troubleshooting

SupportAssist Diagnostics

Performs a complete hardware check using embedded BIOS diagnostics.

Display Built-in Self Test

Instructions for running a self-test on the computer's display.

Diagnostics

Information about diagnostic LEDs and their meanings.

Recovering the Operating System

How Dell SupportAssist OS Recovery helps diagnose and fix OS issues.

Flashing BIOS (USB Key)

Steps to update the BIOS using a bootable USB drive.

WiFi Power Cycle

Procedure to resolve WiFi connectivity issues by cycling power to devices.

Flea Power Release

How to discharge residual static electricity from the computer.

Getting Help and Contacting Dell

Self-Help Resources

Lists online resources for Dell product information and support.

Contacting Dell

Information on how to contact Dell for sales, technical support, or customer service.

Dell OptiPlex 5490 All-In-One Specifications

General

Operating System	Windows 10 Pro
Display	23.8-inch FHD (1920 x 1080) Anti-Glare LED-Backlit Display
RAM	Up to 64GB DDR4
Storage	Up to 1TB SSD or 2TB HDD
Graphics	Intel UHD Graphics
Ports	RJ-45
Wireless	Wi-Fi 6, Bluetooth 5.1
Webcam	Dual array microphone
Audio	Internal speakers
Dimensions	540.0 mm