My battery went flat and I changed it last night. I have a passcode for my itouch. When I switch on my touch brings up a picture to connect to itunes. I have tried connecting to itunes but itunes says that i need to enter my passcode into the touch to get it to work. How do i enter the passcode when the unit won't boot up to take me to the correct screen. I have tried booting up by holding the 2 buttons when not connected to my pc, but that doesn't work.