My iphone 5s does not light up anymore no matter how I press the home and sleep button, but when I call it using other phone, it rings but the screen is still black. Can anyone help me with this problem? I got my iphone a week ago.

My iphone 5s does not light up anymore no matter how I press the home and sleep button, but when I call it using other phone, it rings but the screen is still black. Can anyone help me with this...
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