I've had this issue
before with my TI-83 Plus. I'm not sure exactly the solution I used, but these
steps progress through the mildest to most extreme methods of fixing the
calculator.
Solution 1: Take the batteries out.
Odds are you've tried
this already, but it bears mentioning.
With the calculator on,
remove the triple A batteries housed in the back. After a few seconds, replace
them and turn the calculator on.
Solution 2: Clear the RAM.
Remove one of the AAA
batteries. Press and hold the [CLEAR] key. While holding [CLEAR], reinsert the
AAA battery and then turn the calculator on. The calculator should display the
message "RAM Cleared". Release the [CLEAR] key and then press it one
more time to remove the message.
Solution 3: Reinstall the operating system
Remove one of the AAA
batteries. Press and hold the [DEL] key. While holding [DEL], reinsert the AAA
battery and then turn the calculator on. The calculator should display "Waiting...Please
install calculator software now"
Here is the website to reinstall your OS.
First you'll need the TI-Connect
software.
Solution 4: Remove all sources of power. This is a risky move, but if your
calculator will absolutely not work after you try even reinstalling the
operating system, it might be your last hope.
Remove all of the batteries
including the round lithium battery for 5 minutes. After the 5 minute period,
reinsert all of the batteries and turn the calculator on. Adjust the contrast
if necessary.
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