I have iphone 4 i bought from apple online in august this year and the phone stopped working. It shut down and never came back on. I thought it went into DFU mode but that wasnt the case. I tried holding the home and lock buttons and nothing happened. I put it on the charger for over 24hrs and nothing happened. I connected it to my macbook and the iphone was not recognized by any app. Anyone had this issue? What is the problem?