Help? my iphone 4 has shut off. i left it in the car all day but it didnt over heat or anything because it worked afterwards. but now it wont come back on. ive tried updating it, and holding down the home button. my lock button doesn't work.

i also tried hooking it up to the charger but nothing

Dear Ashley - Y'day, I had the same problem.  Before shutting off the phone vibrated for a minute or two and then the phone stopped working.  I tried restart, charge all through y'day but it did not work.  However, I left the phone without charging over night and tried today morning - luckily, it started and prompted me to upgrade to 5.1.1, which I did.  I too have posted a question for help if there is some bug to fix.  Hope your phone will also work again.  All the best.

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