Green tint

1st you need to narrow down where the issue may be , try the monitor on another system. Try a different monitor on yours.


That will rule out 90% of where the issue may be. If the monitor has the same issue on another computer, monitor issue. If a different monitor has the same issue on your PC, swap out the cable, try a different output on the video card, last step is to replace the video card.
 
One problem that I used to have was that my cable was loose. None of the green came through, so it gave my display a purple tint.

Just something you might want to check.