HP iPAQ hx2000 Series User Manual page 19

To perform a hard reset:
1. Press and hold down the Calendar and iTask buttons.
2. While holding down these buttons, use the stylus to
lightly press the Reset button on the bottom of the iPAQ
Pocket PC for about two seconds.
3. When the Pocket PC screen begins to fade, release the
Calendar and iTask buttons first, and then remove the stylus
from the Reset button.
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CAUTION: If you push and hold the Reset button for more than two
seconds, the battery disconnects. To restart the unit, either plug the unit
into the AC Adapter or press the Reset button again.
4. The Pocket PC resets and powers on.