HP 39g Graphing Calculator User's Guide download pdf (Page 259)

Reference information R-5

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.

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HP 39g Graphing Calculator User's Guide Page 259