I TRIED THE FOLLOWING ON MY PHONE AND IT WORKED... 100 % I HAVE HAD MY GALAXY S4 FOR A LITTLE OF OVER TWO YEARS WITH NO ISSUES AT ALL, RECENTLY MY POWER BUTTON SHORTED OUT AND HAD TO HAVE IT REPLACED, OUT OF WARRANTY I WENT TO A PHONE REPAIR PLACE. GOT IT FIXED ABOUT ABOUT 2 MONTHS AGO. AND NOW...