Report "TI83 Troubleshooting... Josh - Read your reset procedures and I have a similar problem except: My daughter had the calculator for a few years and it did work before. I installed a new backup battery and replaced the four AAA batteries with new. I can't even get the calculator to power up - - the display remains black. As I said, I did try the reset procedures that you listed, but the calculator still will not show anything on the display. Should I give up and trash it?"