Lenovo ThinkPad T420/T420i User Guide

About this manual

This guide begins with important safety and regulatory information, followed by an overview of the ThinkPad T420/T420i hardware, indicators, and specifications. It also explains how to access ThinkVantage tools and other pre‑installed software.

Subsequent chapters cover using the laptop—keyboard shortcuts, UltraNav, power management, connectivity, and display options—along with maintenance tasks such as battery care, component replacement, and system upgrades. The manual finishes with troubleshooting tips, driver updates, and contact information for Lenovo support.

What's inside

• Important Safety Information
• Product Overview
• Using the Computer
• Power Management and Battery Care
• Connectivity and Ports
• Replacing Components
• Upgrading the Computer
• Advanced Configuration
• Troubleshooting and Support

Frequently asked questions

How do I put the ThinkPad into sleep mode?

Press Fn+F4 to place the computer in sleep (ready) mode.

Where can I download the latest drivers for my ThinkPad?

Visit the Lenovo support site at http://www.lenovo.com/support and use System Update to obtain the latest drivers.

What should I do before moving the laptop with a hard drive installed?

Turn off the computer and place it in sleep or hibernate mode before moving it.