HP-48SX battery leakage and hourglass always on

[BartDB]

Hi,

You can try to do a hardware reset.

The reset hole is under one of the top rubber feet. Remove the top rubber feet and you will see a hole. Look for the one with a lightly moulded "R" next to it, that is the reset hole. Carefully insert an unfolded paper clip into this hole until the calculator resets.

See here:
https://www.support.hp.com/us-en/document/bpia5166

Also try removing the batteries and short the top and bottom battery terminals to remove remaining charge, or leaving the calculator without a battery several days.

Edit: please note that all of the above will result in loss of RAM contents

-Bart