Sometimes a financial calculator can get locked up and become unresponsive. It's also possible that a setting was accidentally changed so that it is no longer functioning as desired. In each of these cases, it may be necessary to reset the calculator to its factory settings. Several different models of financial calculators exist, mainly produced by Hewlett Packard and Texas Instruments. The following steps differ depending on the type of calculator, but represent the process for the most popular models.
Reset the Hewlett Packard 10BII
Simultaneously hold down the ON, N and FV keys, then release all three keys at the same time.
The calculator will display CORP HP 2000 and then ALL CLEAR.
Reset the Hewlett Packard 12C
Simultaneously hold down the - and ON keys. Release both keys at the same time.
The calculator will turn on and display Pr Error. Don't panic when you see this message because it just means that the calculator reset. Pressing any key will clear the message.
Reset the Texas Instruments BA II Plus and BA II Plus Professional
Simultaneously hold down the 2nd, +/-, and ENTER keys. Release all three keys at the same time.
The calculator will display RST 0.0.
Most calculators also include a reset button on the back of the case or within the battery compartment. You can reset the calculator by pressing the tip of a paperclip into the reset button and releasing it after a few seconds.