Well, my HX4700 arrived today

and my first of what will no doubt be many questions is:
Does it actually turn off?
When I press the little button at the top it just seems to turn the light off, but the screen still has stuff on it. So, when i tried to put one of the screen protectors on I kept activating stuff on the screen!! I've tried holding the button down for a few seconds but it still wont turn off.
All the button seems to do is switch the light on and off.
I did try and do a search on this forum before asking such a lame question but couldn't find anything.
I'm sure it's just me but if someone could help me out with this simple one.
thanks
lorax