Lenovo ThinkCentre M800, Hardware Maintenance Manual, Page: 81 / 178

• Ensure that the storage drive your computer starts up from is listed as the first startup device in the Setup
Utility program. Refer to “Changing the startup device sequence permanently” on page 65.
Note: In rare cases, the storage drive with the operating system might get corrupted or damaged. In such
cases, you might need to replace the storage drive. Refer to Chapter 9 “Installing or replacing hardware”
on page 87.
Networking problems
This section provides solutions to networking-related problems.
Ethernet LAN problems
My computer cannot be connected to an Ethernet LAN
Solutions:
• Connect the cable from the Ethernet connector to the RJ45 connector of the hub.
• Enable the Ethernet LAN feature in the Setup Utility program. See “Starting the Setup Utility program” on
page 61. Then, follow the instructions on the screen.
• Enable the Ethernet LAN adapter.
1. Depending on your Windows version, do one of the following:
– For Windows 7: Click the Start button to open the Start menu.
– For Windows 10: Right-click the Start button to open the Start context menu.
2. Click Control Panel . View Control Panel using Large icons or Small icons, and then click Network
and Sharing Center ➙ Change adapter settings .
3. Right-click the Ethernet LAN adapter icon and click Enable .
• Update or reinstall the Ethernet LAN driver. See “Keeping your computer current” on page 52.
• Install all networking software that is necessary for your network environment. Check with your LAN
administrator for the necessary networking software.
• Set the same duplex for the switch port and the adapter. If you configured the adapter for full duplex,
ensure that the switch port is also configured for full duplex. Setting the wrong duplex mode might
degrade performance, cause data loss, or result in lost connections.
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).
The Wake On LAN feature does not work
Solution: Enable the Wake On LAN (WOL) feature in the Setup Utility program. See “Starting the Setup Utility
program” on page 61. Then, follow the instructions on the screen.
Chapter 7
.
Troubleshooting, diagnostics, and recovery
73