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Lynn ClarkSep 9, 2025
What to do if my Dell OptiPlex 7490 All-In-One Desktop has a PCI failure?
- DDr. George BairdSep 9, 2025
If your Dell Desktop experiences a PCI, video card/chip failure, replace the system board.
What to do if my Dell OptiPlex 7490 All-In-One Desktop has a PCI failure?
If your Dell Desktop experiences a PCI, video card/chip failure, replace the system board.
What to do if my Dell OptiPlex 7490 All-In-One Desktop has a processor failure?
To address a processor failure on your Dell Desktop, run the Intel CPU diagnostics tools. If the issue continues, consider replacing the system board.
How to fix BIOS failure on Dell OptiPlex 7490 All-In-One?
If your Dell Desktop experiences a BIOS or ROM failure, flash the latest BIOS version. If the problem continues, the system board may need to be replaced.
What to do if my Dell OptiPlex 7490 All-In-One has a display failure?
To resolve a display failure on your Dell Desktop, flash the latest BIOS version. If the problem persists, consider replacing the LCD module.
How to fix RAM failure on Dell OptiPlex 7490 All-In-One Desktop?
To fix a memory or RAM failure in your Dell Desktop, try resetting the memory module. If the problem persists, replace the memory module.
How to fix system-board error on Dell Desktop?
To address a system-board or chipset error on your Dell Desktop, flash the latest BIOS version. If the issue continues, consider replacing the system board.
How to fix TPM Detection Failure on Dell OptiPlex 7490 All-In-One Desktop?
To resolve a MBIST TPM Detection Failure on your Dell Desktop, replace the system board.
How to fix LCD power rail failure on Dell Desktop?
If your Dell Desktop experiences a LCD power rail failure, replace the system board.
How to fix Power-rail failure on Dell OptiPlex 7490 All-In-One Desktop?
If your Dell Desktop experiences a power-rail failure, and the EC ran into a power sequencing failure, replace the system board.
How to fix Management Engine (ME) error on Dell OptiPlex 7490 All-In-One Desktop?
If you encounter a Management Engine (ME) error on your Dell Desktop, and a timeout error is displayed while waiting on ME to reply to HECI message, replace the system board.
General| Display Size | 23.8 inches |
|---|---|
| Display | FHD (1920 x 1080) Anti-glare |
| RAM | Up to 64GB DDR4 |
| Graphics | Integrated Intel UHD Graphics |
| Operating System | Windows 10 Pro |
| Ports | USB 3.2 Gen 1 Type-A, USB-C 3.2 Gen 2, HDMI, Ethernet, Audio out |
| Wireless | Wi-Fi 6 (802.11ax) and Bluetooth 5.1 |
| Audio | Stereo speakers |
Guidelines to protect the computer and ensure personal safety during servicing.
Steps to take before starting internal computer operations.
Initial steps to prepare the system before working inside it.
Components and use of the ESD Field Service kit.
Lists the components of the ESD field service kit.
Guidelines for safely transporting static-sensitive components.
Tools required for component removal and installation procedures.
Details of screws used for various components.
Identifies and lists the main internal and external components of the computer.
Step-by-step guide to remove the fixed stand from the computer.
Step-by-step guide to install the fixed stand onto the computer.
Step-by-step guide to remove the articulating stand.
Step-by-step guide to remove the height adjustable stand.
Step-by-step guide to install the height adjustable stand onto the computer.
Step-by-step guide to remove the optional cable cover.
Step-by-step guide to install the optional cable cover.
Step-by-step guide to remove the back cover of the computer.
Step-by-step guide to install the back cover onto the computer.
Step-by-step guide to remove the computer's hard drive.
Step-by-step guide to install the computer's hard drive.
Step-by-step guide to remove memory modules from the computer.
Step-by-step guide to install memory modules into the computer.
Step-by-step guide to remove the system-board shield.
Step-by-step guide to install the system-board shield onto the computer.
Step-by-step guide to remove the M.2 2230 solid-state drive.
Step-by-step guide to install the M.2 2230 solid-state drive.
Step-by-step guide to remove M.2 2280 SSD or Intel Optane memory.
Step-by-step guide to install M.2 2280 SSD or Intel Optane memory.
Step-by-step guide to remove the internal system fan.
Step-by-step guide to install the internal system fan.
Step-by-step guide to remove the coin-cell battery.
Step-by-step guide to install the coin-cell battery.
Step-by-step guide to remove the wireless network card.
Step-by-step guide to install the wireless network card.
Step-by-step guide to remove the computer's camera assembly.
Step-by-step guide to install the computer's camera assembly.
Step-by-step guide to remove the bottom cover of the computer.
Step-by-step guide to install the bottom cover onto the computer.
Step-by-step guide to remove the computer's power-supply unit.
Step-by-step guide to install the computer's power-supply unit.
Step-by-step guide to remove the power-supply fan.
Step-by-step guide to install the power-supply fan.
Step-by-step guide to remove the UMA heat sink.
Step-by-step guide to install the UMA heat sink.
Step-by-step guide to remove the discrete heat sink.
Step-by-step guide to install the discrete heat sink.
Step-by-step guide to remove the computer's processor.
Step-by-step guide to install the computer's processor.
Step-by-step guide to remove the rear I/O bracket.
Step-by-step guide to install the rear I/O bracket.
Step-by-step guide to remove the computer's system board.
Step-by-step guide to install the computer's system board.
Step-by-step guide to remove the computer's speakers.
Step-by-step guide to install the computer's speakers.
Step-by-step guide to remove the power-button board.
Step-by-step guide to install the power-button board.
Step-by-step guide to remove the computer's microphones.
Step-by-step guide to install the computer's microphones.
Step-by-step guide to remove the side I/O board.
Step-by-step guide to install the side I/O board.
Step-by-step guide to remove the computer's audio board.
Step-by-step guide to install the computer's audio board.
Step-by-step guide to remove the wireless antenna modules.
Step-by-step guide to install the wireless antenna modules.
Step-by-step guide to remove the computer's display panel.
Step-by-step guide to install the computer's display panel.
Step-by-step guide to remove the middle frame of the computer.
Step-by-step guide to install the middle frame of the computer.
Overview of the BIOS/System Setup program and its functions.
Explanation of the BIOS and its role in system management.
Instructions on how to access the BIOS setup utility.
How to manage the system's boot device order.
Explanation of keyboard keys used for navigation within System Setup.
Detailed list and description of various system setup options.
Special considerations for updating BIOS with BitLocker enabled.
Instructions for updating BIOS using a bootable USB drive.
Procedure to set up system and BIOS passwords for security.
How to modify or remove existing system and setup passwords.
Procedure to clear CMOS settings, resetting BIOS to defaults.
How to clear BIOS or system passwords via Dell support.
Steps to run the display's built-in self-test for diagnostics.
Overview of the SupportAssist diagnostics tool for hardware checks.
Detailed steps to run the SupportAssist pre-boot diagnostic check.
Explains diagnostic LED behavior and problem descriptions.
Information on using Dell SupportAssist OS Recovery for system recovery.
Procedure to flash BIOS using a bootable USB drive.
Steps for updating the system BIOS.
Procedure to troubleshoot WiFi connectivity by power cycling devices.
Procedure to release residual power from the computer.
List of resources for obtaining product information and support.
