Took the phone off the charger last night to find just the htc logo (in green) against a white background. On/Off switch unresponsive. Took battery out to disconnect power. Refitted battery but same result. Tried this several times. Left phone alone for a couple of hours. When I returned to it the battery had gone flat and phone had switched off. Reconnected the charger and once power had increased was left with a screen showing PHONE LOCKED and several options for Rebooting etc. My problem is I have not done a back up and have over 500 contacts in the memory and a lot of irreplaceable photos in the gallery. Can I back this up or retrieve any of the content with the phone in its current state? NB.