I've just plugged it in now and turned machine on. Both the lights on the flicker fixer are operational with the green (FF-Mode) light flickering. The message on my LCD is "input not supported." I will wait a few minutes and see how it goes.
It usually works straight away with my 1200 even with this LCD.
Thank you for all your input and support so far 
Really much appreciated that we have such a nice community
It sounds like your monitor is getting a signal it can't sync with so is displaying the "input not supported" meaning the signal coming in is not supported. If turning the adjustment screw is adjusting the frequency then it may then start to send a signal your monitor can sync with and display an image.
