Power Effective reboot
My son's iPhone 4s which he uses as an iPod (no SIM card) was hit with the power effective message but won't reboot like it is supposed to. The screen is black and when I plug it in, it will double vibrate every 8 seconds but no reboot. I held the on/off button and the home button for 10 seconds, and 20 seconds, and then 30 seconds but nothing happened. I can plug it into iTunes and I restored factory settings but still nothing on the screen. Siri won't work either.
HELP!! What can I do to get this phone up and running again??
iPhone 4S