Lenovo ThinkPad T420/T420i User Manual

About this manual

This manual begins with important safety and regulatory notices, followed by a detailed product overview that shows the locations of controls, connectors, indicators, and model labels on the ThinkPad T420/T420i. It also lists the pre‑installed ThinkVantage utilities and explains how to access them.

Subsequent sections cover using the computer—including keyboard shortcuts, UltraNav, power management, and connectivity—security features such as passwords and fingerprint readers, recovery procedures, component replacement, upgrades, advanced configuration, and troubleshooting. The guide ends with support information and references to Lenovo’s online resources.

What's inside

• Product Overview
• Using the Computer
• Security
• Recovery Overview
• Replacing Components
• Upgrading the Computer
• Advanced Configuration
• Preventing Problems
• Getting Drivers
• Troubleshooting

Frequently asked questions

How do I put the ThinkPad into sleep (standby) mode?

Press Fn+F4 to put the computer into sleep (standby) mode.

How do I put the ThinkPad into hibernation mode?

Press Fn+F12 to put the computer into hibernation mode.

Where can I find the safety and warranty guide for this ThinkPad?

Visit Lenovo’s support website at http://www.lenovo.com/support and select User guides & manuals.