How to fix Flickering LCD/CRT monitor screen?

If the screen flickers, make sure the display settings in Windows match the native resolution and refresh rate for the monitor. You can find the native resolution of a flat panel display in the specifications, in the printed material or on the box that came with the monitor. Some common native resolutions are 800 x 600, 1024 x 768, 1920 x 1080, and 1680 x 1050. To find out more about optimal screen resolutions click the link:-- http://schematicsdiagram.blogspot.com/2011/06/how-to-resize-desktop-background.html

The most common refresh rate for LCD monitors is 60 Hz. This normally cannot be changed for flat panel displays using Plug and Play settings. However, if you are using special video software to increase or decrease the refresh rate, change the refresh rate to match the default refresh rate specification of the monitor. To find out more about refresh rates click the link below:-- http://schematicsdiagram.blogspot.com/2011/06/how-to-set-monitors-refresh-rate.html

STEP 1
To change the screen resolution and refresh rate settings in Windows, do the following:
- In Windows XP
Click the link for setting up the optimum screen resolution for Windows XP http://schematicsdiagram.blogspot.com/2011/06/how-to-resize-desktop-background.html

- In Windows Vista
1. Click Start, and then click Control Panel .
2. Find the Appearance and Personalization area, and click Adjust Screen Resolution .
3. Move the slider bar until the screen resolution matches the native resolution.
4. Click Advanced settings, and then click the Monitor tab.
5. Select the Screen refresh rate that matches the default rate for your monitor (if it is not already selected).
6. Click OK, and then click OK again.

If you cannot select the native resolution or the native resolution is unavailable, continue to the next step to update the drivers for the graphics adapter on the computer.

You can get the latest updated video drivers from the video hardware manufacturer's Web site. Here is a list showing some of the video hardware websites:

Check for NVIDIA video driver updates at NVIDIA Home Page.
Check for ATI/AMD video driver updates at ATI Home Page.
Check for Intel video support and downloads, Intel Downloads.

After updating the video drivers, go back to Step 1 and try to change the screen resolution again.
Note: If you cannot select the native resolution after updating the video drivers, the graphics adapter in the computer might not support that resolution and may need to be upgraded.

If after changing the resolution and updating video drivers the flickering persists then check the video cable connections. Unplug the cable and inspect the cable for damage. If the cable is damaged, replace it with a new cable. Try to use cables less than 3 meters (10 feet) long.

Monitors are sensitive to magnetic fields so have a look at the environment around the monitor. Speakers, florescent lights, fans, cell phones, radios, and any other electrical device can cause flickering. Temporarily move electrical items away from the monitor to see if they is producing a field that causes the flicker.

If the monitor has more than one type of connection available such as VGA, DVI, or HDMI, try a different type of connection.