|RIGHT click on a blank part of your main desktop screen, select Properties (goes to Display Properties), click on the Settings tab. |
What does it say there ?
What monitor on what specific video adapter ?
If it doesn't have a named specific video adapter, you need to install the specific
drivers for your video adapter
If it DOES have a named specific video adapter, but it says Default Monitor, or unknown monitor or similar, you need to change that to at least Plug-n-Play Monitor.
See response 9 here:
"When you get to the desktop screen , RIGHT click on blank part of the main Desktop screen - Properties "
- OR -
When the monitor is connected to the computer, go to the Microsoft Update web page on the Microsoft web site and do a Custom Search.
Look in the optional Hardware updates, if any are found - if it lists the drivers for your monitor model, select that to install - it will download and install the specific monitor drivers AND it will set Windows to actually use them.