Solution 34841: Troubleshooting a TI-84 Plus C Silver Edition Requesting a Password.
How do I use my TI-84 Plus C Silver Edition when it is requesting a password?
The presence of certain assembly shell programs developed outside of Texas Instruments are known to cause the TI-84 Plus C Silver Edition to request a password to use the calculator. The password will have to be entered correctly or the assembly shell program will need to be removed in order to bypass the password and use the calculator.
To remove the assembly shell program:
Press the reset button on the back to delete all the items that are in the RAM of the graphing calculator. This includes all programs, games, pictures, functions, lists, etc.
If the reset procedure above does not work, please contact TI-CARES for further assistance.
Please see the TI-84 Plus C Silver Edition guidebook for additional information.