I was going to make a phone call so I turned on the display then dragged the phone icon to the lock ring to open, the phone froze up. I let it sit for a minute hoping it would unlock but it didn't. I did a battery pull and put it back in. Phone will not turn on. I put it on the charger, it won't even show it is charging. The battery was at 75% so I don't think it is that. Any thoughts or ideas?