Lenovo ThinkPad E475 User Manual

Also see for 20H4: Hardware Maintenance Manual

Memory module problemsPrint these instructions now and keep them with your computer for reference later.Problem: My memory module is not operating properly.Solution: Check the following items:1. Verify that the memory module is installed and seated correctly in your computer.Remove all added memory modules to test the computer with only the factory-installed memorymodules, and then reinstall the memory module one at a time to ensure a proper connection.2. Check for error messages during startup.Follow the appropriate corrective actions for power-on self-test (POST) error messages.3. Verify that the latest UEFI BIOS for your model has been installed.4. Verify the proper memory configuration and compatibility including the maximum memory size and thememory speed.5. Run diagnostic programs. See “Diagnosing problems” on page 61.Ethernet problems• Problem: My computer cannot connect to the network.Solution:Ensure that:– The cable is installed correctly.The network cable must be securely connected both to the Ethernet connector of your computer and tothe RJ45 connector of the hub. The maximum allowable distance from the computer to hub is 100 m(328 ft). If the cable is connected and the distance is within the acceptable limits but the problempersists, try a different cable.– You are using the correct device driver. To install the correct driver, do the following:1. Go to Control Panel, and ensure that you view Control Panel by Category.2. Click Hardware and Sound ➙ Device Manager. If you are prompted for an administratorpassword or confirmation, type the password or provide confirmation.3. Double-click Network adapters to view all network adapters. If an exclamation mark ! is displayednext to the adapter name, you might not be using the correct driver or the driver might have beendisabled.4. Right-click the highlighted adapter, click Update driver, and then follow the instructions on thescreen to update the driver.– The switch port and the adapter have the same duplex setting.If you configured the adapter for full duplex, ensure that the switch port also is configured for fullduplex. Setting a wrong duplex mode can degrade performance, cause data loss, or result in lostconnections.– You have installed all networking software that is necessary for your network environment.Check with your LAN administrator for the necessary networking software.• Problem: The adapter stops working for no apparent reason.Solution: The network driver files might be corrupt or missing.• Problem: My computer is a Gigabit Ethernet model and I use a speed of 1000 Mbps, the connection failsor errors occur.Solution:66 E475 User Guide