Try reinstalling the operating system. You will need a PC with [https://education.ti.com/en/products/computer-software/ti-connect-sw|TI-Connect] and the [https://education.ti.com/en/software/details/en/158B7669E4C0493A84D33D9A22FDBD3C/ti-84plusceoperatingsystem|TI-84 Plus CE OS].
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Hold 2nd and del, and press the reset key in the back. Then, connect the calculator to the PC, launch TI-Connect, and send the Operating system to the calculator.
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Hold 2nd and del, and press the reset key in the back. Then, connect the calculator to the PC, launch TI-Connect, and send the operating system to the calculator.
Try reinstalling the operating system. You will need a PC with [https://education.ti.com/en/products/computer-software/ti-connect-sw|TI-Connect] and the [https://education.ti.com/en/software/details/en/158B7669E4C0493A84D33D9A22FDBD3C/ti-84plusceoperatingsystem|TI-84 Plus CE OS].
Hold 2nd and del, and press the reset key in the back. Then, connect the calculator to the PC, launch TI-Connect, and send the Operating system to the calculator.