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colleenhopkinsAug 18, 2025
Why is the power button on my Dell OptiPlex 5490 All-In-One solid amber and the system won't boot?
- SSheryl BrightAug 18, 2025
The power supply or another device in the system is failing. Replace the system board.
Why is the power button on my Dell OptiPlex 5490 All-In-One solid amber and the system won't boot?
The power supply or another device in the system is failing. Replace the system board.
Why is the power button blinking white and my Dell OptiPlex 5490 All-In-One is unable to boot?
The power supply is normal, but another device in the system is failing or not installed properly.
What to do if no memory or RAM is detected in my Dell OptiPlex 5490 All-In-One?
Check and confirm that the memory module is installed properly. If the problem continues, replace the memory module.
What to do if there is a memory or RAM failure on my Dell Desktop?
Reset the memory module. If the problem continues, replace the memory module.
How to fix System board BIOS or ROM failure on Dell OptiPlex 5490 All-In-One Desktop?
Flash the latest BIOS version. If the problem continues, replace the system board.
What to do if my Dell OptiPlex 5490 All-In-One has a display failure?
Flash the latest BIOS version. If the problem continues, replace the LCD module.
How to resolve a system-board or chipset error on a Dell Desktop?
Flash the latest BIOS version. If the problem continues, replace the system board.
What to do if the recovery image is not found on my Dell OptiPlex 5490 All-In-One Desktop?
Flash the latest BIOS version. If the problem continues, replace the system board.
What to do if invalid memory is installed on my Dell Desktop?
Reset the memory module. If the problem continues, replace the memory module.
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?
This indicates that the recovery image is not found. Flash the latest BIOS version. If the problem continues, replace the system board.
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 |
Steps to take before performing any internal computer operations.
General safety measures to follow before and during disassembly/reassembly.
Measures to prevent damage from static electricity to electronic components.
Details on the components and usage of an ESD field service kit.
Guidelines for safely transporting sensitive electronic parts.
Steps to follow after completing internal computer maintenance.
Lists the tools required for component removal and installation procedures.
Details the types, quantities, and images of screws used in the system.
Procedures for removing and installing the fixed and height-adjustable stands.
Step-by-step guide for removing and installing the computer's hard drive.
Instructions for removing and installing RAM modules.
Procedures for removing and installing M.2 NVMe solid-state drives.
Guide on safely removing and installing the CPU.
Detailed steps for removing and installing the main system board.
Lists the supported operating systems for the OptiPlex 5490.
Step-by-step guide to download and install drivers from Dell's support website.
Explains the function of the BIOS in managing data flow and system operations.
Instructions on how to access the BIOS setup utility by pressing F2 during startup.
Details the keyboard keys used to navigate and interact within the BIOS setup program.
How to bypass the default boot order and boot from a specific device.
Overview of various configurable settings within the BIOS, categorized by function.
Procedure to reset BIOS settings to default by clearing CMOS.
Information on how to clear system or BIOS passwords.
Performs a complete hardware check using embedded BIOS diagnostics.
Instructions for running a self-test on the computer's display.
Information about diagnostic LEDs and their meanings.
How Dell SupportAssist OS Recovery helps diagnose and fix OS issues.
Steps to update the BIOS using a bootable USB drive.
Procedure to resolve WiFi connectivity issues by cycling power to devices.
How to discharge residual static electricity from the computer.
Lists online resources for Dell product information and support.
Information on how to contact Dell for sales, technical support, or customer service.
