I unboxed my new Experia Z yesterday, I used it quite a lot transferring data etc and charged it via mains and my laptop throughout the day. i set the alarm and went to bed with the phone on 98% charge and the phone in airplane mode, i have woke up this morning, the handset is off and having been on mains charge for over half an hour, there is no charging light on and the phone will not switch on. ideas?