Lenovo ThinkPad T420i (English) User Guide - Page 250
Universal Serial Bus problems, A docking station or port replicator problem
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Universal Serial Bus problems • Problem: A device connected to the USB connector does not work. Solution: Open the Device Manager window. Make sure that the USB device setup is correct, and that the assignment of computer resource and the installation of the device driver are correct. For Windows 7 and Windows Vista: 1. Click Start ➙ Control Panel. 2. Click Hardware and Sound. 3. Click Device Manager. If you are prompted for an administrator password or confirmation, type the password or provide confirmation. For Windows XP: 1. Click Start ➙ Control Panel. 2. Click Performance and Maintenance, and click System. 3. Click the Hardware tab, and click the Device Manager button. Refer to "Diagnosing problems" on page 201 and run Lenovo ThinkVantage Toolbox for a diagnostic test of the USB connector. A docking station or port replicator problem • Problem: The computer does not start when you try to turn it on, and does not respond when you try to resume operation. Solution: Make sure that: - The ac power adapter is connected to the docking station or the port replicator. - The docking indicator of the ThinkPad Mini Dock Plus Series 3, the ThinkPad Mini Dock Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W) is on. - The computer is securely attached to the docking station or the port replicator. 232 User Guide