Networking Problems - Lenovo thinkcentre e73 Hardware Maintenance Manual

The monitor works when you turn on the computer, but goes blank when you start
some application programs
Symptom: The monitor works when you turn on the computer, but goes blank when you start some
application programs.
Actions:
• Make sure the monitor signal cable is securely connected to the monitor and the monitor connector on
the computer. A loose cable can cause intermittent problems.
• Verify that the necessary device drivers for the application programs are installed. Refer to the
documentation for the affected application program to see if device drivers are required.
If these actions do not correct the problem, run the diagnostic programs (see "Lenovo Solution Center" on
page 53 for instructions). If you need technical assistance, see "Lenovo Support Web site" on page 33.
The image appears to be flickering
Solutions:
• The screen might be affected by interference from nearby equipment. Magnetic fields around other
devices, such as transformers, appliances, fluorescent lights, and other monitors might be causing the
problem. Move fluorescent desk lighting or any equipment that produces magnetic fields farther away
from the screen. If this does not correct the problem, turn off the computer. Then, adjust the placement of
the computer and other devices so that they are at least 305 mm (12 inches) apart. Turn on the computer.
• Reset the refresh rate supported by your computer.
1. Right-click a blank area on the desktop.
2. Depending on your Windows version, do one of the following:
– For Windows 7, Windows 8, or Windows 8.1: Click Screen resolution ➙ Advanced settings.
– For Windows 10: Click Display settings. On the Display tab, click Advanced display settings ➙
Display adapter properties.
3. Click the Monitor tab, and then reset the refresh rate to be the highest and noninterlaced.
The image is discolored
Symptom: The image is discolored.
Action: The monitor might be affected by interference from nearby equipment. Magnetic fields around other
devices, such as transformers, appliances, fluorescent lights, and other monitors might be causing the
problem. Move fluorescent desk lighting or any equipment that produces magnetic fields further away from
the monitor. If this does not correct the problem, do the following:
1. Turn off the monitor. (Moving a color monitor while it is turned on might cause screen discoloration.)
2. Adjust the placement of the monitor and other devices so that they are at least 305 mm (12 inches) apart.
3. Turn on the monitor.
If these actions do not correct the problem, your monitor might need service. See "Lenovo Support Web
site" on page 33 for details.

Networking problems

The following are the most common networking problems. Select your networking problem from the
following list:
• "Ethernet problems" on page 47
• "A wireless LAN problem" on page 48
46
ThinkCentre E73 Hardware Maintenance Manual