My Samsung Galaxy S6 won't turn on, constant blue light, and a flashing screen

[Android Central Question]

Hey! So I was playing Solitaire on my phone (on power saving mode) and it was working perfectly fine. I turned away for a bit and the screen turned off (as it normally does after a few seconds in power saving mode); but when I went to turn the screen on again, a bit of my screen flashed white, turned back off and a blue light came on. I've tried all the recovery methods on the internet but nothing seems to work. Every time I press and hold one or a few buttons, the screen just flashes.