Lenovo ThinkPad T420si (English) User Guide - Page 203
Memory problems, Networking, Ethernet problems
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Memory problems Print these instructions now and keep it with your computer for reference later. If your memory is not operating properly, check the following items: 1. Verify that the memory is installed and seated correctly in your computer. It may be necessary to remove all added memories to test the computer with only the factory-installed memories, and then reinstall the memory one at a time to ensure a proper connection. For the procedures to remove and reinstall a memory, refer to "Replacing memory" on page 93. 2. Check for error messages during startup. Follow the appropriate corrective actions for Power-on self-test (POST) . See "Error messages" on page 183. 3. Verify that the latest UEFI for your model has been installed. 4. Verify the proper memory configuration and compatibility including the maximum memory size and the memory speed. For details, refer to the instructions in "Replacing memory" on page 93. 5. Run diagnostic programs. Networking The following are the most common networking problems: Ethernet problems • Problem: Your computer cannot connect to the network. Solution: Make sure that: - The cable is installed properly. The network cable must be securely connected both to the Ethernet connector of your computer and to the RJ45 connector of the hub. The maximum allowable distance from the computer to hub is 100 meters. If the cable is connected and the distance is within acceptable limits but the problem persists, try a different cable. - You are using the correct device driver. For Windows 7 and Windows Vista: 1. Click Start, and then click 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. 4. If the ! mark is to the left of the adapter name under Network adapters, you might not use the correct driver or the driver is not enabled. To update the driver, right-click the highlighted adapter. 5. Click Update Driver Software, and then follow the instructions on the screen. For Windows XP: 1. Click Start, and then click Control Panel. 2. Click Performance and Maintenance, and then click System. 3. Click the Hardware tab, and click the Device Manager button. 4. If the x mark is to the left of the adapter name under Network adapter, you might not use the correct driver or the driver is not enabled. To update the driver, right-click the highlighted adapter. 5. Click Properties. The Properties window appears. Chapter 10. Troubleshooting computer problems 187