Texas Instruments TI-85 Calculator "black square" Questions

...black square dot in the upper left corner. TO Connect can read the unit, but nothing works on the display. If the small black square does not blink The Calculator is Locked it need an hardware reset ...

black square in top left...won't turn off Upon turning on calculator, I only get a small black square in top left corner and nothing else. It won't turn off unless I remove a AAA battery. My 15 yr old

...black square and keys don't work the cursor blinks as a checkered black square instead of solid and half the buttons are unresponsive while others bring me to an error:memory Hi, The memory of the ...

...black square on screen means what? The manual can be downloaded from here: http://college.cengage.com/mathematics/latorre/calculus_concepts/4e/assets/students/gcp/latorre_4e_grcalcguide.pdf First ...

Why is the screen on my TI-82 calculator so dark when I turn it on? It's a black square. How can I lighten the screen? Try Press 2nd key and release it Press and HOLD Down arrow to lighten.

...square black box and an arrow in the rigth down-corner. I can move the black-box, but I can't press anything! Well.. I can press it, but nothing happens :) Hope there is a simple way to fix this... ...

...not stay on. Shows a black square box in upper left corner. If I type fast enough, I cant get one number in before it shuts down. What can I do to make this work? try changing the watch-battery as ...

a black squar is on ti 83plus when i cut iy on The cursor can be in insert mode __ or overwrite mode (the square)

Error turning on When I turned it on it flashed black squares along the screen. When I pulled out the battery's I noticed that the case was slightly ajar. As I rock it back and forth I can hear a ...

...left and then pressing on the left column the black key that has the yellow square root sign on top. (the x^2 key). The square root will show up and then you just put 5 and enter. This is equal to ...