Lenovo ThinkCentre M79, Hardware Maintenance Manual

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My computer is a Gigabit Ethernet model and I use a speed of 1000 Mbps, but the connection fails
or errors occur
Solution: Connect the network cable to the Ethernet connector using Category 5 wiring and a 100 BASE-T
hub/switch (not 100 BASE-X).
My computer is a Gigabit Ethernet model, but it cannot be connected to the network at 1000 Mbps,
but at only 100 Mbps
Solutions:
• Try another cable.
• Set the link partner to auto-negotiate.
• Set the switch to be 802.3ab-compliant (gigabit over copper).
I cannot connect to a wireless LAN using the built-in wireless networking card
Solutions:
• Install the latest wireless LAN drivers.
• Place your computer within the range of a wireless access point.
• Enable the wireless radio.
• Check Network Name (SSID) and your password.
– On Windows 7:
1. Click Start ➙ Lenovo ThinkVantage Tools ➙ Access Connections .
2. Switch to the Advanced view, and then click the Mobile Hotspot tab to check your SSID and
password.
– On Windows 8.1:
1. Open Control Panel. For more information, see “Accessing Control Panel on the Windows 8.1
operating system” on page 51.
2. Click Network and Internet ➙ Network and Sharing Center to check your SSID and password.
Sound does not come from the Bluetooth headset or headphone but comes from
the local speaker even though the headset or headphone is connected using the
Headset profile or AV profile
Solution:
1. Exit the application that uses the sound device (for example, Windows Media Player).
2. Open Control Panel.
Note: For detailed information on how to open Control Panel on Windows 8.1, see “Accessing Control
Panel on the Windows 8.1 operating system” on page 51.
3. Click Hardware and Sound
➙
Sound .
4. Select the Playback tab.
5. If you are using the Headset profile, select Bluetooth Hands-free Audio , and then click Set Default . If
you are using the AV profile, select Stereo Audio , and then click Set Default .
6. Click OK .
Note: Bluetooth is supported only on some computer models.
Chapter 8
.
Troubleshooting and diagnostics
85