Green color on Monitor when connected to macbook pro

Do I need to dl drivers or something for the external monitor that I plug into my Macbook Pro? I use it with my HP Laptop and the color is fine but when I connect it to the Mac everything has a green color to it.

I have the new Macbook Pro
and it is a sony flat panel monitor

How are you connecting this to the Macbook Pro? An adapter? Green sounds like one of the other colors is missing. Bad adapter maybe??

I am connecting with an adapter that I got from the apple store at the mall.

Well apparently the monitor was going out because I connected the macbook to another monitor and it works fine. and now when I connected the sony monitor into the desktop pc it is also greenish colored, so that just fixed that problem. Looks like a new monitor is in the near future.