Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
The answer to your question depends upon one detail about how you start up the calculator:
- are you starting it up on battery power only?
- or, is it being started up on the AC adapter's power?
Then the battery may be dead, or nearly. Rechargeable batteries always fail eventually.
(Or is it a non-rechargeable battery?)