So, i found a Samsung GP Duos inside my cabinet which was a gift to my niece 4yrs ago. When I tried to use it, it won't turn on. When I press the power button, it just vibrates once and flash turns on for a second then turns off. I tried to charge it and felt some heat that a normal phone does. But still, it won't turn on. Tried to press power + volume up/down + home button for 30s, but still won't turn on.