TI-83 plus won't turn on

TI-83 plus won't turn on

My TI-83 Plus has sat mostly unused for the last 8 years. Today, I plugged in 4 batteries, and got an all-black screen. Assuming it was a contrast issue, I hit 2nd+down repeatedly. That did nothing. I then took out the batteries and put them back in. This time, the calculator wouldn't turn on.