I am an owner of the calculator fx-9860GII and recently, something happened to my calculator. Everytime I want to graph something (be it a simple linear graph or a quadratic graph), the graphing utility won't work and it'll display "Argument Error" as the message. I consulted some of my friends, and they told me that there's probably something wrong with the zoom function. I do remember that before this happened, whenever I tried graphing, my graph wouldn't show even when I zoomed out.
Now I can't even go to the zoom option because when I press draw, all it would show me is the message of "Argument Error" and I would have to exit. I've tried resetting the system and even deleting memories and other things, but this is still going on. Can someone help me?
