Memory Module Problems; Ethernet Problems - Lenovo 20JA User Manual

Error codes
0287: Discrete graphics error
0288: Computer display error

Memory module problems

Print 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 memory
modules, 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 the
memory speed.
5. Run diagnostic programs. See "Diagnosing problems with Lenovo Companion" on page 59.

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 to
the 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 problem
persists, 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 administrator
password or confirmation, type the password or provide confirmation.
3. Double-click Network adapters to view all network adapters. If an exclamation mark ! is displayed
next to the adapter name, you might not be using the correct driver or the driver might have been
disabled.
4. Right-click the highlighted adapter, click Update driver, and then follow the instructions on the
screen to update the driver.
– The switch port and the adapter have the same duplex setting.
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ThinkPad S5 2nd Generation User Guide
Solutions
1. Reinstall or replace the discrete graphics card
(service provider only).
2. Replace the system board (service provider only).
1. Reconnect the display cable on both the system
board side and the computer display side (service
provider only).
2. Replace the system board (service provider only).