The LCD on my Sx has gone completely dark green!
If you press a Tab menu button twice, it displays the input SDI signal in a full screen window. This speeds up looking at the input signal and then going backto the user interface. However, if you have no signal it will display a full screen of "No video" which is dark green.

When I have a web browser connected to my unit I can't see the contents of the LCD
You have probably set your unit to have a static IP address. This is a known bug which has been fixed and has been fixed in software version 0.09.2429 or later.

How can I generate the 'Pathalogical' test pattern?
This is officially the SMPTE 'CheckField' pattern and called CheckField on the Sx.