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Solution: Make sure that:<br />
– The cable is installed properly.<br />
The network cable must be securely connected both to the Ethernet connector of your computer and<br />
to the RJ45 connector of the hub. The maximum allowable distance from the computer to hub is<br />
100 meters. If the cable is connected and the distance is within acceptable limits but the problem<br />
persists, try a different cable.<br />
– You are using the correct device driver.<br />
For Windows 7 and Windows Vista:<br />
1. Click Start, and then click Control Panel.<br />
2. Click Hardware and Sound.<br />
3. Click Device Manager. If you are prompted for an administrator password or confirmation, type<br />
the password or provide confirmation.<br />
4. If the ! mark is to the left of the adapter name under Network adapters, you might not use the<br />
correct driver or the driver is not enabled. To update the driver, right-click the highlighted adapter.<br />
5. Click Update Driver Software, and then follow the instructions on the screen.<br />
For Windows XP:<br />
1. Click Start, and then click Control Panel.<br />
2. Click Performance and Maintenance, and then click System.<br />
3. Click the Hardware tab, and click the Device Manager button.<br />
4. If the x mark is to the left of the adapter name under Network adapter, you might not use the<br />
correct driver or the driver is not enabled. To update the driver, right-click the highlighted adapter.<br />
5. Click Properties. The Properties window appears.<br />
6. Click the Driver tab.<br />
7. Click the Update Driver button. The Update Device Driver wizard appears. Follow the instructions<br />
on the screen.<br />
– The switch port and the adapter have the same duplex setting.<br />
If you configured the adapter for full duplex, make sure the switch port is also configured for full<br />
duplex. Setting the wrong duplex mode can degrade performance, cause data loss, or result in lost<br />
connections.<br />
– You have installed all networking software that is necessary for your network environment.<br />
Check with your LAN administrator for the necessary networking software.<br />
• Problem: The adapter stops working for no apparent reason.<br />
Solution: The network driver files may be corrupt or missing. Update the driver by referring to the<br />
“Solution” description for the procedure to make sure that the correct device driver is installed in the<br />
preceding problem.<br />
• Problem: If your computer is a Gigabit Ethernet model and you use the a speed of 1000 Mbps, the<br />
connection fails or errors occur.<br />
Solution:<br />
– Use Category 5 wiring and make sure that the network cable is securely connected.<br />
– Connect to a 1000 BASE-T hub/switch (not 1000 BASE-X).<br />
• Problem: The Wake on LAN (WOL) feature is not working.<br />
Solution:<br />
– Make sure that WOL is enabled in the ThinkPad Setup.<br />
Chapter 10. Troubleshooting computer problems 213