My iphone turned off and won't turn on again?

I have a Iphone 4s and the battery was 15% when i turned it off because i wanted to restart it, but then when i was trying to turn it on again, it didn't turned on. So i read online some fix but noone of them helped me, I connected it to pc and wall, when its in charge it make a sound on same time intervals, And vibrates if its on silent. I tried to keep the home button and lock button together for 10, and more than 10sec but nothing helped, Can anyone help me?

It would be a lot easier to take it to the apple store because they will know what is wrong with it. The people online are not mega experts and they do not know how to fix it unless it has happened to them. But if you take it to the apple store then you can know for sure what is wrong with it, and then you can fix it, they will not charge you for them to have a quick look, but they will charge you if it is badly damaged. But if you have insurance on the phone and you have only had it a year maybe they will replace it.

Let the battery drain to zero percent. Then fully charge it and it should powerup.

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