Just purchased an Apple TV to go with my I Pad. I bought correct hdmi cable and I have the required 1080 tv resolution. The set up is apparently simple but I can only get a blank tv screen. We have tried using another hdmi cable. We have followed advice and held remote down on menu and scrolling buttons. Tried everything we can think of but only get a white light on apple box, not even an apple logo, just a blank screen. Can't think of what to do other than return it to John Lewis. I would be so grateful for any help out there.