Before you give your handset to repair shop or buy new handset, please try the following procedure to repair your device. First charge your battery more then 70%, backup your important data like phone-book, message, email, images and settings and in most cases take out SIM card and SD card. After doing hard reset not possible to recover your data, so online backup is always important. For all of your data, a backup should be done on a external device, hard drive, raid system media or SD card.
How to Hard Reset HP iPAQ rz1710
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.