I tried furiously blowing in to the back of mine with all 4 AAA batteries and the back up battery removed then i left the batteries out for 2 days it works again with really minimum use... you have to repeat the blowing and leaving out nonsense every week sometimes you regain use by rubbing the AAA batteries back and forth while they're in place
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Hopefully this will get you around the problem for the time being. You can download a program called "Virtual TI" written by Rusty Wagner. You will also need to download the TI-84 ROM file from the Internet and place it in the folder with the Virtual TI program. Once Virtual TI is running, press F12 and select the version of the calculator ROM that you have. You can also try WabbitEmu.
TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.
If that isn't it, then remove all four AAA batteries. Press and hold the ON key for ten seconds. Replace the batteries and turn the calculator on. (You may have to adjust the contrast as described above.)
TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on at all. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.
I'd try hooking it to the computer using ti connect explorer and see if deleting the programs there would help. I had a calculator that did the same thing and never did fix it. But if your memory can be delete and reinstalled it might work.
This is kinda a weird situation. Because it's usually the other way around. Your ram will clear if your calculator is frozen. So take out all 5 batteries from the back. Even the back up battery. Then reset it again. 2nd then + then 7 then 1 Then 2. Good luck.