My monitor is displaying "Input not supported". What does that mean?
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The good news, there is nothing wrong with your computer. Let us go through the regular check list and tell how to resolve this issue.
Before we start check list:
Make sure the
monitor is compatible with your operating system. Most monitors in
the market are approved to work with Windows XP. If you are running Any
other operating system ( Example: Linux, any Apple OS or ever an
earlier version of Windows) may cause this message.
Refer to the manual
to check the native resolution and refresh rate to your LCD monitor.
Keep them handy, we may need them later.
Make sure the driver
for your monitor is installed correctly. If in doubt, contact your
monitors manufacturer tech support for assistance with the proper
installation of the driver.
If none of the above is the cause of your issue, lets move on to the
next step.
Wrong resolution and/or refresh rate is the most common reason(s) for this message to appear. You can get the native resolution and refresh rate from your monitor's manual. Let us check and compare.
1.
To check the
resolution and refresh rate values, Click on Start 
then
Control Panel 
2. In the Control Panel window, Click on Appearance and Themes
3. From the Appearance and Themes window, click on Display
4. You should see the Display Properties window, click on the Settings tab.
5.
Make sure 1 the
resolution is set to the native resolution then Click Apply 
.
Restart your
computer. If this did not resolve this issue or if your resolution is
set to the correct value, Click on 2 Advanced 
. Please refer to the numbers on the
image below to help you locate the area.
6. Once you click on the Advanced button, you should see the window below. Make sure the DPI (Dot Per Inch) value is correct to your monitor (refer to your monitor's manual for this value) then click on the Monitor tab.
7. After you
click on the Monitor tab, you should see the window below. Make
sure the refresh rate value is the one recommended by your manual then
click Apply .
Restart your computer. If the message is still there. Your monitor need to be checked by an authorized service center. Please contact the manufacturer's tech support.