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If you configured the adapter for full duplex, ensure that the switch port also is configured for full
duplex. Setting a 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.
• Problem: My computer is a Gigabit Ethernet model and I use a speed of 1000 Mbps, the connection fails
or errors occur.
Solution:
– Use Category 5 wiring and ensure 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 it cannot connect to the network at 1000 Mbps.
Instead, it connects at 100 Mbps.
Solution:
– Try another Ethernet cable.
– Ensure that the link partner is set to auto-negotiate.
– Ensure that the switch is 802.3ab-compliant (gigabit over copper).
Wireless-LAN problem
Problem: I cannot connect to the network using the built-in wireless network card.
Solution: Ensure that:
• The Airplane mode is off.
• Your wireless-LAN driver is the latest version.
• Your computer is within the range of a wireless access point.
• The wireless radio is enabled.
Note: If you are using the Windows 7 operating system, click Show hidden icons on the taskbar. The
Access Connections icon is displayed. For more information about the icon, see the Access Connections
help information system.
For the Windows 7 operating system, check the network name (SSID) and your encryption information. Use
the Access Connections program to verify this case-sensitive information.
Wireless-WAN problem
Problem: A message is displayed indicating that an unauthorized WAN card is installed.
Solution: The WAN card is not supported on this computer. Remove the WAN card. For more information,
see "Replacing the wireless-WAN card" on page 97.
Note: Some models do not have a wireless-WAN card.
.
Chapter 6
Troubleshooting computer problems
75
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