Check that Xming is running
You can tell that Xming is running if you see the "X" icon in the Windows System Tray. (The System Tray is at bottom of the screen on the right side.)
By the way, if you right-click on the Xming icon, you will find a menu. This menus allows you to find out more about Xming. It also allows you to exit Xming so that it is no longer running.
One way to check if PuTTY is configured for a remote X session is to inspect the environment variable named DISPLAY (after you have logged in). This can be done with the following command
The output of this command should be something like "localhost:12.0". If the echo command does not return any text, then you should check the configurations. See the Xming FAQ for more details.
If you can't get Xming working with the solutions found here, please let us know. Also, if you have an experience with Xming that might help other users, please report those to us. Send e-mail messages to firstname.lastname@example.org. Thanks!