Reset button

From TreoCentral

The reset button is located on the back side of the Treo on the left next to the battery. It is used to perform resets.

Palm moved the reset button on the Treo 750v, which runs Windows Mobile. The reset button on the Treo 750v is located next to SD card slot behind the springy door on the side of the Treo.

On the Treo 680, Treo 750, and Treo 755p, there is no reset button. In order to reset these Treos, you simply remove the battery and reinsert it.