[Q] My Xperia S wont start, no led, no vibration, wont charge. topic

My friend borrowed my phone to take a selfie and returned it shortly afterwards(im giving this info because i cant say if it shut down while my friend was using it or while it was in ny pocket). I just put it in my pocket and after about 20 minutes i wanted to see the time and it wouldnt turn on. I tried pressing only the power button and nothing, i tried power + vol+ it didnt work, waited to get home to recharge, put it on my charger and no led no nothing. I am just wondering what could be the problem and is there a eay to fix it? Is it the battery? Also the water damage indicator on the back is pink but i have never exposed it to water.(that has been pink for over a month before it died).