Teh Ti-83 Puls Okay, so I have a Ti-83 Plus with a big problem. Sometimes, now and then, when i turn it on, it shows nothing. I can turn the contrast to max and then it shows the black screen. The thing is, the screen is on but there is no cursor or anything. This has been a problem for a while and i used to just pop out the batteries and put them back in and it would work. But now...it doesn't! What am i going to do? I have a big test tomorow! Can someone please help me?