okay ANOTHER update....
I have figured out that what is happening is that the 'blue' colour in my monitor is non existant. If i go into the osd of the monitor and fiddle with the colours, red changes it, green changes it, but moving blue from 0 to 100 does NOTHING.
and green and red equal yellow
Aww yes nice notice. I didn't even think about that, the colored ray guns in monitors are notorious for going out. It sucks that you've only had the monitor for a little while, but that does indeed sound like what's happening. Good luck