hard resetting will erase all personal information in your phone, the reset button is the small hole on the bottom of the device to the right of the usb port (use your stylus to push it in)
if the hard reset doesnt work try this
http://forum.ppcgeeks.com/showthread.php?t=24906
i had a similar issue once related to the unlocker, just make sure you dont let your battery run out because it wont charge until you have a rom of some kind on there, so keep your battery out until your ready to go