iPhone 6s Plus not turning on
Got my iPhone 6s Plus today, very impressed.
Finally got all the apps installed to mirror my previous iPhone and decided to switch it off to see how the start up times compare to my last iPhone.
Now the phone will not switch on, screen is blank, nothing happens when I press the home button.
If I press the on/off button for 2 seconds the apple logo displays on the screen for 30 seconds and then returns to a blank screen.
IF I press the home and on/off button together for 5 seconds Apple logo appears for 30 seconds and then returns to blank screen.
HELP!!!

