Dell P2421D

Learn more about the use, features, assembly, and compatibility of the Dell Pro Dual Monitor Arm MDA20.

Learn more about the use and features of the Dell Pro Single Monitor Arm MSA20.

Learn how to report a lost or stolen Dell laptop or desktop, including necessary details. Follow our guide for timely action and how to contact Dell Support.

Learn how to stop a Dell computer from going to sleep, change sleep settings, wake a computer from sleep, and fix power saving mode issues.

Check your warranty status, renewing your warranty, transferring ownership, international warranty support, expired warranty support or register your Dell product.

Learn how to fix issues searching for a Dell Service Tag, Express Service Code, Product ID, Serial Number, or Part Number returns no results.

The following article provides information about the proper way to insert and remove the USB Type-C connector on Dell laptops and devices. (For example: Docking Stations and Monitors.)

Manage Dell monitors, keyboards, mice, webcams, pens & audio devices on Windows 11/10 with Dell Display & Peripheral Manager.

Learn how to return a Dell warranty replacement part within the United States.

Learn how to fix multiple monitor problems when Windows does not recognize the additional displays by checking connections, display settings, graphics drivers, monitor inputs, and hardware.

Learn how to update your Dell monitor firmware using the Dell Display and Peripheral Manager app on Windows or Mac, or manually with a downloaded package. Step-by-step instructions included.

This article provides information about screen flicker on Dell monitors when using third-party virtual display software.

Is your Dell laptop not charging or showing video? Your USB-C cable may be damaged. Learn what to look for, how to fix it, and prevent it from happening.

Download Dell and Alienware monitor drivers, software, and manuals. Compare DDPM, Color Management, PremierColor, and more, with install steps.

Learn how to setup dual or multiple monitors in Microsoft Windows and troubleshoot dual or multiple monitor issues. Learn how to connect your computer to a TV or a Dell wireless monitor.

Fix your Dell monitor power issues in minutes. Simple step-by-step solutions for monitors that won't turn on or have no power light.

Learn how to identify the differences between in-plane switching (IPS) glow and light leakage in a Dell monitor using an IPS panel.

Dell Monitor driver remediation is available for an Improper Link Resolution Before File Access ('Link Following’) vulnerability that could be exploited by malicious users to compromise the affected system.

This article explains the procedure to open a Service Request (SR) using the Dell support page. Get help fast for your Dell device. No more waiting on hold. No more tech headaches. Dell makes it simple to fix problems, schedule repairs, or get support—right from your device or our support website.

This article helps you identify the display or video issue based on symptoms that you notice.

This article provides information about basic safety precautions that everyone must take before accessing the internals of a computer or electrical equipment. Find information about how to protect against electrostatic discharge (ESD), prevent electrostatic damage to the components, and take safety precautions when lifting electronic equipment.

Choosing between daisy chain and docking? Fixing blurry mixed-resolution monitors? Get advanced multi-monitor setup guidance beyond the basics.

Learn about the different types of video cables including USB-C, HDMI, DisplayPort, DVI, and VGA. Find out which ones work best with your monitor's resolution for the clearest picture quality.

Discover how to quickly locate the 20-digit Dell PPID (Part Piece Identification) number on any Dell component. Complete walkthrough for batteries, adapters, monitors, docking stations, keyboards, mice, and motherboards with both physical and digital methods.

Discover Dell's display resolution guidelines for LCD panels on our monitors and laptops. We explain what dots and pixels are, introduce you to the Premium Panel Exchange, and show you how to spot bright or dead pixels on your screen.

You may notice slight color differences between displays (for example, laptop vs. monitor) when viewed side by side. This is normal due to variations in hardware and calibration; adjustments can reduce the difference, but exact matching may not be possible.

Computers may experience reduced responsiveness or delays when an external monitor is connected, and the Dell Display and Peripherals Manager (DDPM) is installed.

This article provides information about integrated self-test (BIST, also called built-in diagnostics, or BID) and self-test feature check (STFC) diagnostic tests available on Dell monitors. Learn how to run a diagnostic test to diagnose hardware issues with Dell monitors.

Looking to register, update, change or transfer ownership and warranty information of your Dell computer? This article shows you how.

Configure the On-Screen Display (OSD) settings on the Dell LCD display to achieve maximum resolution using a DisplayPort connection.