Replying to Weird problem with cell phone (motoral krzr k1m)

yeah my phone was working fine i was using it yada yada today, i put it in my pocket pulled it out 5 min later and it was all weird
it doesnt turn on anymore, i hold down the power button and the keypad lights up but nothing happens past that or on the screen
if i plug it in the keypad lights up and again nothing else
my step dad has the same battery and i tried puting that in, and nothing
so yeah anyone had a similair problem or have advice?