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Dell OptiPlex 7090 Tower - User Manual

Dell OptiPlex 7090 Tower
104 pages
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OptiPlex 7090 Tower
Service Manual
Regulatory Model: D28M
Regulatory Type: D28M005
May 2021
Rev. A00

Table of Contents

Questions and Answers

  • A
    Austin ParkerSep 2, 2025
    How to fix PCI or video card/chip failure on Dell Desktop?
    • T
      Terri TorresSep 2, 2025
      If your Dell Desktop experiences a PCI or Video card/chip failure, replace the system board.
  • P
    Pedro MooreSep 2, 2025
    What to do for Intel ME (Management Engine) Error on Dell Desktop?
    • J
      jenniferwilliamsSep 3, 2025
      If your Dell Desktop shows an Intel ME (Management Engine) Error, it indicates a timeout waiting on ME to reply to HECI message. If the problem persists, replace the system board.
  • I
    Ian BurtonSep 3, 2025
    Why is available memory decreasing on Dell OptiPlex 7090 Tower?
    • N
      Nicole FreemanSep 3, 2025
      If your Dell Desktop shows decreasing available memory, one or more memory modules may be faulty or improperly seated. Reinstall the memory modules or, if necessary, replace them.
  • M
    melissa28Sep 4, 2025
    What to do if GATE A20 FAILURE on Dell Desktop?
    • A
      Alexander ThomasSep 4, 2025
      If your Dell Desktop shows GATE A20 FAILURE, a memory module may be loose. Reinstall the memory module or, if necessary, replace it.
  • A
    Andrew BrewerSep 4, 2025
    How to fix DISK C failed initialization on Dell OptiPlex 7090 Tower?
    • C
      Courtney MurphySep 4, 2025
      If your Dell Desktop reports 'DISK C: FAILED INITIALIZATION', run the hard drive tests in Dell Diagnostics.
  • D
    Debra FreemanSep 5, 2025
    How to fix keyboard controller failure on Dell OptiPlex 7090 Tower Desktop?
    • C
      Carol GarciaSep 5, 2025
      If you get a keyboard controller failure on your Dell Desktop, and you are using external keyboard, check the cable connection. Restart the computer, and avoid touching the keyboard or the mouse during the boot routine. Run the Keyboard Controller test in Dell Diagnostics.
  • D
    Dawn CameronSep 5, 2025
    What causes auxiliary device failure on Dell OptiPlex 7090 Tower?
    • M
      Mr. Michael PhillipsSep 5, 2025
      If your Dell Desktop shows an auxiliary device failure, the touchpad or external mouse may be faulty. For an external mouse, check the cable connection. Enable the Pointing Device option in the System Setup program.
  • P
    pbennettSep 6, 2025
    What to do if bad command or file name on Dell OptiPlex 7090 Tower?
    • M
      Miss Teresa SnyderSep 6, 2025
      If your Dell Desktop displays 'BAD COMMAND OR FILE NAME', ensure that you have spelled the command correctly, put spaces in the proper place, and used the correct path name.
  • J
    Jonathan BautistaSep 7, 2025
    What does cache disabled due to failure mean on Dell OptiPlex 7090 Tower Desktop?
    • B
      Benjamin RobertsonSep 7, 2025
      If your Dell Desktop displays 'CACHE DISABLED DUE TO FAILURE', the primary cache internal to the microprocessor has failed. No answer.

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 IconGeneral
Processor Options10th Gen Intel Core i3, i5, i7, i9
ChipsetIntel Q470 Chipset
MemoryUp to 128GB DDR4 2933MHz
Storage Options2.5-inch HDD/SSD, M.2 PCIe NVMe SSD
Graphics OptionsIntegrated Intel UHD Graphics
Operating SystemWindows 10 Home/Pro, Ubuntu Linux
PortsFront: USB 3.2 Gen 2 Type-C, USB 3.2 Gen 1; Rear: USB 2.0
Expansion Slots1 x PCIe x16, 1 x PCIe x4, 1 x PCIe x1
Power Supply260W, 300W or 500W
Dimensions293.0 mm

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