Hi, newbie here. Would be very grateful for any help. I was using my iPad and for no reason it suddenly stopped responding to touch. I cannot even power it down as the confirmatory slider doesn't respond. I can (just) slide from one home screen to the next, but that is all. I thought if I could power it down it might reset, but I can't do that as I can't move the slider to confirm shut down. I was typing something into a dialogue box and between one letter and the next, it stopped. The home button works, if that's relevant to anything. Updated to iOS5 last week. Everything else is unchanged including apps and settings. It was given to me in May so not even a year old. No evidence of damage to the screen, and no reason there should be any. Can anyone help? Thank you.