Question about Texas Instruments TI-89 Calculator

# I have a problem with TI89 calculator. The screen is frozen and I cant do nothing with it. Please help me out!

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• kakima Sep 28, 2010

Hold the 2ND, left-arrow, and right-arrow keys, then press and release the ON key. Does that do anything?

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Having received no response in half a year, I assume my suggested reset solved the problem.

Posted on Mar 29, 2011

Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
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Posted on Jan 02, 2017

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### I received this solution, but at the end the calculator asked me about some invalid certificate. Now the ti 89 is stuck at the boot screen because if I retry, it goes thru the whole process again and asks...

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The answer I gave you was taken verbatim from the TI FAQ and knowledge base. I copied and pasted the part relevant to you calculator.
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All we can do know is wait for their reply.

k24674.

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