Report "I have a ti 83 plus calculator. one day i turned it on and it didn't work the screen displayed me previous data but none of the keys responded except for the on button, which wouldn't help any ways. i cleared the ram, didn't help. The screen said ram cleared but the keys were still frozen. i removed the coin battery, didn't work. i even downloaded a new OS and that didn't work either. the calculator is relatively new and i really need help!!!"