If the graph is not visible, you may need to adjust your window. Or, the equation may not be activated. Press `Y=`

and check to see if the \(=\)sign is highlighted.

If you get a range error, ERR: WINDOW RANGE, quit the message and press `WINDOW`

. Alter the window settings so that Xmin is smaller than Xmax and so that Ymin is smaller than Ymax.

If you press and get an unfamiliar window, or if the axes are not visible in the ZStandard window, you may need to return the Mode or Format menus to their default settings. See Troubleshooting in Section B.1.

If you get a dimension error, ERR: INVALID DIM, you may have a StatPlot turned on. Press `2nd`

`Y=`

\(4\) `ENTER`

to turn off the StatPlots.

If the bug does not move along the curve, `TRACE`

may not be activated. Press `TRACE`

and then the left or right arrow key.

If you get the error, ERR: INVALID, you have probably entered a value of \(x\) that is outside the window. Adjust the window settings accordingly.

If the \(x\)-axis or \(y\)-axis is too thick, the tick marks are too close together. Press `WINDOW`

and make Xscl or Yscl larger. Set \(Xscl=0\) or \(Yscl =0\) to remove the tick marks.

If you get ERR: NO SIGN CHNG when using the intersect feature, the calculator did not find any intersection point within the current window. Alter the window settings so that the two curves meet within the window. If the two curves are tangent, the calculator may simply fail to find the point of intersection.