Why is does my screen get jumbled with random characters?
I just got this TI-83 Plus yesterday. I haven't even got to really use it. Today, I sit down to graph a problem and the screen starts glitching and there is lines in random places and numbers everywhere. It is a jumbled mess and I have no idea how to fix this. I tried to shut it off and turn it back on and everything is normal for a bit, but then it starts acting up again. I also replaced the batteries and it's still not working. How do I fix this?
42 
9 
11 