Compaq 1610 Reference Manual page 45

During a severe system lockup or when a malfunction cannot be
corrected any other way, you may need to completely reset and
restart your handheld PC. Your C-Series can be reset two
different ways, depending upon your situation and the action that
is called for: normal reset, which does not affect data that has
been saved in memory, and full reset, which erases memory
contents and settings.
A normal reset restarts your handheld PC much like pressing
restarts a computer. To perform a normal reset, follow
these steps:
1. Save all work (if possible).
device; the device must remain on in order to reset.
2. Close the lid and turn over the device.
3. Using the stylus tip, press the reset button.
4. The device will automatically restart.
Do not press the power button to turn off the