• Take the batteries out, including the round backup battery. Press and hold the
ON
button for 2 minutes to remove any possible remaining power from the internal
capacitors. Leave the calculator overnight and re-insert fresh batteries.
• If this happened when running a game or aplet that you've downloaded from the
internet then consider that this may be the source of the problem. Backup
anything that you want to keep to the PC and do a full reboot to restore factory
settings.
• Try a full reboot using
ON+SK1+SK6.
Some less likely options:
• Did the paperclip feel funny when you inserted it? There should be a very subtle
sensation of 'pressing a button' as the paperclip shorts out the batteries
momentarily. Could you have accidentally bent the shorting contact last time you
used a paperclip so that it is permanently shorting out?
• Check the battery compartment. Are any of the metal contacts broken or out of
place? Are the batteries firmly in contact with all of them? Is anything out of
place? Do any of the batteries or the metal contacts show corrosion? If so, clean
them carefully, being careful not to get moisture inside the calculator.
• Have you recently dropped the calculator or spilled liquid on it? If so, this is not
good. It is probably permanently dead. Did you need a very expensive
paperweight?
• Check the USB and Serial ports at the top of the calculator. Do they have
anything wedged in them courtesy of a young child perhaps?
Extracted from “Mastering the hp 39gs & hp 40gs Graphical Calculators” copyright © 2006 Applications in Mathematics & Hewlett
Packard. Permission is granted for use in education and for owners of HP calculators but not for commercial use.
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