iPhone stilllllll will not turn on

Heres the story, i did have water damage, but i pulled it appart had it completely dried, and it came back to life. two weeks later and it was still working fine, no problem with the battery holding a charge and no problems with the screen or responce... today tho i was at the doctors office, and shut it off. once i was out i tried to turn it back on and nothing, plugged it into my car charger and nothing, held the two buttons and nothing. i dont know how to make it restore since it seems to have no power even when i have left it plugged in for 20+ mins, so when i plug it to the computer it wont recognize a device... someone please give me hope that its not fried... it just doesnt make sence since it was powering and acting fine for so long before now!