Icons green tint to them
I'm not sure but I think this model uses an integrated graphics card which would then involve replacing the entire motherboard.
It may be that the screen backlight is getting old - they often age by showing a tint, usually it is pink but I have seen them go greenish.
Try an external monitor connected to the laptop via the VGA d connector. If the picture on the external monitor has a good colour balance then it is probably not a faulty graphics chip, and likely to be the laptop screen.