Did thne power die before this happened, also how did you hard reset device if unit was frozen... More info may help to explained what happened before you noticed the problem...
Try a battery pull and boot into safe mode. Turn the phone on and at the second HTC screen hold the volume down button.
I definitely understand having a working device is extremely important. I hope your device is up and running at this point. If you need additional assistance please PM me with your name and mobile number. Thank you.