The power button on my S5 only partially works. If you press on the upper third of it, it will work. Pressing on the lower 2/3rds of it is unresponsive. Has this happened to anybody else, and how do you fix it?
Better take it to trusted phone service centre. Let them examine it and fix it. Probably will only cost a little. Better than risking breaking your phone further by trying to fix it by yourself.