Left the house with a fully charged iphone early, drove for 15 minutes, looked at my phone to find the screen blank. The HOME button won't respond and neither will the power button etc...the phone is completely, and inexplicably dead...any suggestions at all here before I have to trek over to an Apple Store? I have tried removing the sim card etc and plugging it back in to charge! It was on charge all night also and is only 6 months old! Are there any simple tricks to reset the phone that I am unaware of? Thanks in advance...I did do a quick search but couldn't find any answers.