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Turn the calculator on, press and hold the 2nd button, then press the up-arrow button to increase the contrast or the down-arrow button to decrease the contrast. If you go too far, release both buttons, press and hold the 2nd button, and press the appropriate arrow button.
TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible. Does it?
The screen may be too dim to read. Sometimes when the batteries are low, the screen automatically dims itself. The problem is, it doesn't undo that when the batteries are replaced. Try pressing 2ND->Up arrow key repeatedly while the calculator is turned on and the screen should start to darken so that you can read it.
It is possible that the contrast is set too dim. If that is the case, you can make the display darker. Press [SHIFT][MODE] to enter (SETUP) When set up screen is displayed, use the DOWN Arrow to open the second page. Press [6:<CONT>], then press the right arrow to darken display.
TI calculators have an annoying habit of dimming the screen when batteries are changed. Turn the calculator on (or at least press and release the ON button). Press and release the 2ND button. Press and hold the up-arrow button for five seconds or so until the screen becomes visible.
If this doesn't fix it, please post a comment and we'll go on from there.
Displaying the grid on the screen is a graphing option accessed through the command GridOn. To turn the grid off, press [2nd][ZOOM] (FORMAT). Use down arrow to reach the 3rd line. Highlight GridOff and press [ENTER]. Press Graph to return to the graph screen.
How you activated the GridOn command by a single press of a button is a prowess. I wish you could teach me this legerdemain.
This error show up when you are graphing out of the plot menu. If you are not graphing data points from list menu, you need to turn the plots off. In the y= screen, you will see the words plot 1, plot 2, etc across the top of the screen. If one of the plots is highlighted (black box over the words), you need to turn it off. This can be done by arrowing up and highlighting the box and pressing enter. When you arrow back down, the plot should be off and you will be able to enter an equation in the y= lines and graph.
If you are graphing from the plot menu, this error lets you know that one of the lists you are graphing is longer than the other.
Another way to fix the problem is to reset the calculator by pressing 2nd button then plus sign then 7 then 1 then 2. This will reset the calculator however if you are graphing from lists, your data will be erased. Hope this helps.