Solution 16409: Correcting a TI-89 Family, TI-92 Family, or Voyage™ 200 Graphing Calculator That is Locked Displaying "Busy" for a Prolonged Period of Time.
How do I correct the "busy" error that has been displayed on my TI-89 family, TI-92 family or Voyage 200 graphing calculator for over 10 minutes?
The TI-89 family, TI-92 family or Voyage 200 graphing calculators may display "busy" for a certain time while processing complex computations or solving equations. However, if the calculator displays busy for more than 10 minutes please see the below instructions:
NOTE:
The following procedures will completely reset the calculator. Please, bear in mind that this will erase the contents of the calculator's memory and restore all manufacturer's defaults.
• Press and hold down the [2ND] key and the left and right arrow keys all at the same time.
• Press [ON].
• Release all the keys at the same time.
• Adjust the contrast, if necessary.
This should reinitialize the operating system, after which the calculator should then be functional again. If the calculator is still not responding, refer to this Troubleshooting case for additional information.