Dell OptiPlex 7090 Tower - User Manual

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OptiPlex 7090 Tower

Service Manual

Regulatory Model: D28M

Regulatory Type: D28M005

May 2021

Rev. A00

Main Page

Questions and Answers

K
Kimberly ZhangAug 30, 2025
What causes power rail failure on Dell Desktop?
- K
  Kelly Friedman DVMAug 30, 2025
  If your Dell Desktop experiences a power rail failure, it indicates that the EC ran into a power sequencing failure. If the problem persists, replace the system board.
B
Brandon SmithSep 8, 2025
What to do if error reading pcmcia card on Dell OptiPlex 7090 Tower Desktop?
- S
  Scott AustinSep 8, 2025
  If your Dell Desktop displays 'ERROR READING PCMCIA CARD', the computer cannot identify the ExpressCard. Reinsert the card or try another card.
J
Jennifer EstradaAug 29, 2025
How to fix BIOS recovery image not found on Dell OptiPlex 7090 Tower Desktop?
- E
  erikawilliamsAug 29, 2025
  If the BIOS recovery image is not found on your Dell Desktop, flash the latest BIOS version. If the problem persists, replace the system board.
C
carolsimsSep 22, 2025
What to do if x drive is not accessible on Dell OptiPlex 7090 Tower Desktop?
- A
  Amanda TateSep 22, 2025
  If your Dell Desktop displays 'X:\ IS NOT ACCESSIBLE. THE DEVICE IS NOT READY', insert a disk into the drive and try again.
M
marissa00Sep 9, 2025
What does general failure mean on Dell OptiPlex 7090 Tower?
- T
  trevor97Sep 9, 2025
  If your Dell Desktop displays 'GENERAL FAILURE', the operating system is unable to carry out the command. The message is usually followed by specific information. For example, Printer out of paper. Take the appropriate action.
M
Michael ContrerasSep 13, 2025
Why licensed content is not accessible in MediaDirect on Dell OptiPlex 7090 Tower Desktop?
- B
  Breanna WalkerSep 13, 2025
  If your Dell Desktop displays 'LICENSED CONTENT IS NOT ACCESSIBLE IN MEDIADIRECT', Dell MediaDirect cannot verify the Digital Rights Management (DRM) restrictions on the file, so the file cannot be played.
T
Theresa MillerSep 18, 2025
What does optional ROM bad checksum mean on Dell OptiPlex 7090 Tower Desktop?
- E
  ericortizSep 18, 2025
  If your Dell Desktop displays 'OPTIONAL ROM BAD CHECKSUM', the optional ROM has failed. No answer.
C
Cynthia CarterAug 27, 2025
How to fix system board failure on Dell Desktop?
- D
  Deborah ChangAug 27, 2025
  To address a system board failure (including BIOS corruption or ROM error) on your Dell Desktop, flash the latest BIOS version. If the problem persists, replace the system board.
E
Emily ScottAug 26, 2025
What to do if Dell OptiPlex 7090 Tower shows no boot device available?
- H
  Heather WhiteAug 26, 2025
  If your Dell Desktop displays 'No Boot Device Available', the computer cannot find the hard drive. If the hard drive is your boot device, ensure that the drive is installed, properly seated, and partitioned as a boot device.
M
Mrs. Jaime PaceAug 25, 2025
How to resolve invalid memory installed on Dell Desktop?
- K
  Kimberly SmithAug 26, 2025
  If your Dell Desktop says invalid memory is installed, reset the memory module. If the problem continues, replace the memory module.

Summary

Working Inside Your Computer

Safety Instructions and Precautions

Covers safety guidelines, ESD protection, and handling sensitive components.

After Working Inside Your Computer

Steps to follow after completing internal computer work.

Removing and Installing Components

Tools, Screws, and Component Overview

Lists tools, screw types, and identifies major system components visually.

Side Cover and Front Bezel Procedures

Instructions for removing and installing the side cover and front bezel.

Storage Drive Replacement

Procedures for 2.5-inch and 3.5-inch hard drives, and M.2 SSDs.

Memory Module and Processor Fan;Heat Sink

Steps for replacing memory modules and processor fan/heat sink assemblies.

Processor, Graphics, and GPU Replacement

Instructions for replacing the processor, graphics card, and powered GPU.

Small Component Replacement

Procedures for coin-cell battery, WLAN card, and slim optical drive.

Chassis Fan, VR Heat Sink, Speaker, and Power Button

Steps for replacing chassis fan, VR heat sink, speaker, and power button.

Power Supply Unit (PSU) and Intrusion Switch

Procedures for removing and installing the power supply unit and intrusion switch.

I;O Modules and System Board

Instructions for replacing optional I/O modules and the system board.

Software

Drivers and Downloads

Information on obtaining and installing system drivers.

System Setup

Boot Menu and Navigation Keys

How to access and navigate boot menus and system setup.

System Setup Options Overview

Details system configuration settings available in BIOS.

System and Setup Passwords

Procedures for assigning and managing system and setup passwords.

Troubleshooting

Diagnostics and LED Behavior

Running pre-boot diagnostics and interpreting LED error codes.

Error Message Interpretation

Explanations for diagnostic and system error messages.

WiFi Power Cycle Procedure

Steps to perform a WiFi power cycle to resolve connectivity issues.

Getting Help and Contacting Dell

Self-Help Resources and Contact Information

List of resources and methods for obtaining Dell support.

Dell OptiPlex 7090 Tower Specifications

General

Processor Options	10th Gen Intel Core i3, i5, i7, i9
Chipset	Intel Q470 Chipset
Memory	Up to 128GB DDR4 2933MHz
Storage Options	2.5-inch HDD/SSD, M.2 PCIe NVMe SSD
Graphics Options	Integrated Intel UHD Graphics
Operating System	Windows 10 Home/Pro, Ubuntu Linux
Ports	Front: USB 3.2 Gen 2 Type-C, USB 3.2 Gen 1; Rear: USB 2.0
Expansion Slots	1 x PCIe x16, 1 x PCIe x4, 1 x PCIe x1
Power Supply	260W, 300W or 500W
Dimensions	293.0 mm