VNC FAQ-o-Matic : Troubleshooting Guides : Can you get to the VNC password prompt?
If you start a VNC connection from your Viewer and get as far as getting to a VNC password prompt, you’re 90-percent of the way there. Usually the problem at this point is simply not entering the right password. Which sounds ridiculous…until you consider that a Windows VNC Server may have *two* passwords set on it!