My S6 Edge cannot pass through boot screen

A week ago I was just using my S6 Edge for google translate at school, when suddenly the phone just died by itself, while I still have around 50% of battery charge at that time. I tried to restart the phone by pressing the power button, it turns on, but just stuck on the first screen after booting (Samsung Galaxy S6 Edge powered with android). I tried to restart by pressing power button + volume down, it works but the problem still persists, and a bright white LED Light on the front went on.

I cannot turn it off or even boot to recovery mode until this day, and the only thing that I can do is wait for the phone to lose its battery charge and turn off by itself. If I charge the phone, it turns on but the problem is still there.

What could be the cause of this problem, and how to fix it?

Thanks :)