HP iPAQ rz1715 Hard Reset
How to Hard Reset HP iPAQ rz1715
Use the stylus to lightly press the Reset button.
Press and hold buttons the two bottom-most application buttons on the front of the device and at the same time, with the stylus, briefly press the Reset button on the bottom of your device.
A hard reset deactivates the battery. The Power button does not function until the battery is reactivated. To reactivate the battery When Connect the AC Adapter to the device to charge the device Or Briefly press the Reset button with the stylus.