HP 40G manual To erase all memory and reset defaults, If the calculator does not turn on, 21@ key

To erase all memory and reset defaults

If the calculator does not respond to the above resetting procedures, you might need to restart it by erasing all of memory. You will lose everything you have stored. All factory-default settings are restored.

1.Press and hold the >21@ key, the first menu key, and the last menu key simultaneously.

2.Release all keys.

Note: To cancel this process, release only the top-row keys, then press the third menu key.

If the calculator does not turn on

If the HP 39G/40G does not turn on follow the steps below until the calculator turns on. You may find that the calculator turns on before you have completed the procedure. If the calculator still does not turn on, please contact Customer Support for further information.

1.Press and hold the >21@ key for 10 seconds.

2.Press and hold the >21@ key and the third menu key simultaneously. Release the third menu key, then release the >21@ key.

3.Press and hold the >21@ key, the first menu key, and the sixth menu key simultaneously. Release the sixth menu key, then release the first menu key, and then release the

>21@ key.

4.Locate the small hole in the back of the calculator. Insert the end of a straightened metal paper clip into the hole as far as it will go. Hold it there for 1 second, then remove it. Press the >21@ key.

5.Remove the batteries (see “Batteries” on page R-7), press and hold the >21@ key for 10 seconds, and then put the batteries back in. Press the >21@ key.

Reference information R-5