On the computer, right-click on the desktop.
Sellect "Properties".
Sellect the "Parameters" tab.
Set the "Screen resolution" slider to the desired resolution.
Idealy, it should be the native resolution of your monitor.
Also set the colour quality to "Optimal (32 bits)"
Click the "Apply" button. Click "yes" in the popup.
If you don't have an image or it's distorded, wait a little and the display will revert to the previous state after about half a minute.
Go back and chose another resolution.
Close the properties dialog.
Electro
May 2011