You’re trying to connect to an OS X box and your vnc viewer just doesn’t seem to work. Then, after many a google serch, you discover that OS X’s remote access protocol is incompatible with most VNC servers. Tuning to Apple for help yeilds a solution, for a small(large) fee.
Thankfully, there is a better way. There is a free VNC server for OS X called Vine. Download it and install the server. Now you should be able to connect through a typical VNC client.
Remember, if you use tightVNC to connect, use the F8 key to bring up the menu that allows you to switch to fullscreen and disconnect the session.