Ethernet Problems - Lenovo ThinkCentre 0266 User Manual

• "Bluetooth problems" on page 86
For more information, see "Help and Support" on page 95.

Ethernet problems

For Ethernet problems, select your symptom from the following list:
• "Your computer cannot connect to the network" on page 85
• "The adapter stops working for no apparent reason" on page 85
• "If your computer is a Gigabit Ethernet model and you use a speed of 1000 Mbps, the connection fails
or errors occur" on page 86
• "If your computer is a Gigabit Ethernet model, it cannot connect to the network at 1000 Mbps. Instead,
it connects at 100 Mbps" on page 86
Your computer cannot connect to the network
Symptom: Your computer cannot connect to the network.
Actions: Make sure that:
• The cable is installed properly.
The network cable must be securely connected to both the Ethernet connector of your computer and
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.
• The cable is installed properly.
• You are using the correct device driver.
On the Windows 7 operating system and the Windows Vista operating system , do the following:
1. Click Start ➙ 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 an exclamation mark is displayed next to an 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.
• The switch port and the adapter have the same duplex setting.
If you configured the adapter for full duplex, make sure the switch port is also configured for full duplex.
Setting the 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.
The adapter stops working for no apparent reason
Symptom: The adapter stops working for no apparent reason.
Action: The network driver files may be corrupt or missing. Update the driver by referring to the "Solution"
description for the procedure to make sure that the correct device driver is installed.
The Wake on LAN feature is not working
Symptom: The Wake on LAN (WOL) feature is not working.
.
Chapter 10 Troubleshooting and diagnostics
85