If a piece foreign material such as a pencil lead is lodged in the
I/O port of the calculator, it may create a short causing the
calculator to respond slowly to key press entries. If the piece of conductive material can be removed, it may restore the calculator to normal operating condition.
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Ther is no reset button. You have to take the batteries out.
Take the AAA batteries out and take the back up battery out...located in a little door with a screw just above the AAA batteries. Leave the batteries out for about 8 hours. This is how you reset a TI graphing calculator.
What i think is that your calculator has water damage. It is not dead. There still is hope. The slow response is due may be due to a short in your I/O port. Blow really hard in there that might stop the slow response. Other than that let it sit without the batteries to dry. Then put the batteries back in and if that doesn't work its probably what spongeboob said and your going to need to ditch it.
My screen was frozen and I needed to do a manual reset. If you take out 1 battery from the back....hold the "del" key down and reinsert the battery while holding it down....it will reload the programming into the calc