My iPhone4 with iOS7 suddenly gone dead. Doesn't turn on no matter what is done. I tried connecting to iTunes and try to sync but the De4vices tab remains grayed.

My iPhone4 with iOS7 was working fine. Suddenly and spontaneously it had gone dead.Neithr was it ever dropped down nor any fluid spilled. It doesn't turn on no matter what is done. I tried syncing with iTunes  but the Devices tab in the iTunes remains grayed. It means it doesn't recognise. What shall I do?

No, No, it was not a question of drained battery. I charged iphone overnight and it was charged to 100%. Hardly 2-3% would have got spent before it had gone dead.Gving benefit of doubt of drained battery, I indeed allowed it by connecting to USB for nearly 10 mts before I  pressed the on button. But it was of no avail.
I searched for suggestions and followed the tip given in the forum. I kept both the home button and the wake up/sleep button pressed for 20 sec. The apple icon appeared and booted. Thanks.

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