I would start with resetting the calculator, this is not done the usual way with a reset button on the back, instead, you should do the following.
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=== Remove Battery ===
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Since you can't interact with the calculator at all, start with removing its battery by following the guide I have added below. You can skip replacing the battery, just put the same battery back again.
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This will force the calculator to turn off.
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[guide|140064]
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=== If problem continues ===
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If it still freezes when you do that, redo the process of removing the battery and then do the following steps to factory reset the calculator.
When the calculator is on.
***Step 1:*** Press ``SHIFT`` and then ``9``
***Step 2:*** Press ``3`` to select the "Reset All" option
I would start with resetting the calculator, this is not done the usual way with a reset button on the back, instead, you should do the following.
When the calculator is on.
***Step 1:*** Press ``SHIFT`` and then ``9``
***Step 2:*** Press ``3`` to select the "Reset All" option
***Step 3:*** Press ``=`` to confirm
***Step 4:*** Press the ``AC`` button
Hope this worked! :D