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The most helpful knowledge articles for your product are included in this section.

Dell OptiPlex 755 System Guide
Dell OptiPlex 755 System Guide

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Table of Contents: Installation / Drivers Security / Antivirus Software Hardware - Troubleshooting / Error Codes OptiPlex 755 Knowledge Base Resource Library: Contains all the resources needed to ...

Last Modified: 02 May 2019

Article ID: SLN286258

How to Troubleshoot Slow Performance Issues
How to Troubleshoot Slow Performance Issues

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When asking yourself why is my dell laptop so slow, why has it stopped responding, why does it take longer than expected to respond, or slow to boot up or shutdown, you may be experiencing a ...

Last Modified: 27 Jun 2019

Article ID: SLN171944

How to Find and Activate Microsoft Office 2016 / 2019 / 365 on your Dell System
How to Find and Activate Microsoft Office 2016 / 2019 / 365 on your Dell System

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Get online support for Microsoft Office 2016 / 2019 / 365 installed on your Dell device. Find troubleshooting tip and activation steps for OEM factory installed versions of Microsoft Office. Show ...

Last Modified: 21 Jun 2019

Article ID: SLN304490

How to Troubleshoot and Resolve Memory issues with a Dell Desktop PC
How to Troubleshoot and Resolve Memory issues with a Dell Desktop PC

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This article provides information on what memory issues can be seen and how to troubleshoot them on a Dell Desktop PC. Table of Contents: Desktop Memory Troubleshooting Diagnostics Hardware ...

Last Modified: 17 Jun 2019

Article ID: SLN284238

How to repair the EFI bootloader on a GPT HDD for Windows 7, 8, 8.1 and 10 on your Dell PC
How to repair the EFI bootloader on a GPT HDD for Windows 7, 8, 8.1 and 10 on your Dell PC

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This article provides information about how to resolve an issue with the EFI Bootloader not booting correctly on a GPT Hard Disk Drive for a number of Windows Operating Systems. Table of Contents:

Last Modified: 12 Jun 2019

Article ID: SLN300987


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Featured Video 15 Jan 2013 06:00
No Power? Learn about Dell’s Built In Self Test for power supplies (00:02:56)

Watch this introductory guide for troubleshooting and isolating power issues in newer Optiplex and Precision Workstation desktop systems. Many desktops are now configured with a Built-In Self-Test (BIST) for the power supply. The BIST can be used to isolate and troubleshoot power failures throughout the system. Closed captions available in many languages.