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Turn off the computer, and then turn it on again. 2. If you still see only the cursor on the screen, do the following: – If you have used partition software, examine the partition on the hard disk drive by using the software, and recover the partition if required. – Use the recovery solutions to restore the system to the factory default state. If the problem persists, have the computer serviced. • Problem: My screen goes blank while the computer is on. Solution: Your screen saver or power management might have been enabled. Do one of the following: – Touch the TrackPoint pointing device or the trackpad, or press a key to exit the screen saver. – Press the power button to resume the computer from sleep or hibernation mode. 124 User Guide Beep errors Table 7. Beep errors Problem Solution One short beep, pause, three short beeps, pause, three more short beeps, and one short beep Have the computer serviced. One long and two short beeps The video function has a problem. Have the computer serviced. Four cycles of four short beeps Shut down the computer immediately and have the computer serviced. Five short beeps The system board has a problem. Have the computer serviced. Memory module problems Print these instructions now and keep the instructions with your computer for reference later. If your memory module is not operating properly, check the following items: 1. Verify that the memory module is installed and seated correctly in your computer. It might be necessary to 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). See “Error messages” on page 122. 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. 5. Run diagnostic programs. See “Diagnosing problems” on page 121. Networking problems The following are the most common networking problems. Ethernet problems • Problem: The computer cannot connect to the network. Solution: Make sure 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 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. To install the correct driver, do the following: 1. Open Control Panel and click Hardware and Sound . Device Manager. If you are prompted for an administrator password or confirmation, type the password or provide confirmation. 2. If the exclamation mark ! is displayed next to the adapter name under Network adapters, you might not be using the correct driver or the driver might have been disabled. To update the driver, right-click the highlighted adapter. Chapter 10. Troubleshooting computer problems 125 3. Click Update Driver Software, and then follow the instructions on the screen. – The switch port and the adapter have the same duplex setting. If you configured the adapter for full duplex, make sure that the switch port also is configured for full duplex. Setting wrong duplex mode can degrade performance, cause data loss, or result in lost connections. – 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. Update the driver by referring to the previous solution for the procedure to make sure that the correct device driver is installed. • Problem: My computer is a Gigabit Ethernet model and I use a speed of 1000 Mbps, but the connection fails or errors occur. Solution: – Use Category 5 wiring and make sure that the network cable is securely connected. – Connect to a 1000 BASE-T hub/switch (not 1000 BASE-X). • Problem: The Wake On LAN feature is not working. Solution: Ensure that Wake On LAN is enabled in ThinkPad Setup. If it is, check with your LAN administrator for the necessary settings. • Problem: My computer is a Gigabit Ethernet model, but the computer cannot connect to the network at 1000 Mbps. Instead, it connects at 100 Mbps. Solution: – Try another cable. – Make sure that the link partner is set to auto-negotiate. – Make sure that the switch is 802.3ab-compliant (gigabit over copper). A wireless LAN problem Problem: I cannot connect to the network using the built-in wireless network card. Solution: Make sure that: • Your wireless LAN driver is the latest version. • Your computer is within range of a wireless access point. • The wireless radio is enabled. Note: If you ar...