laptop fail to start

I'm having a big problem about this laptop. My laptop is a fujitsu and it's turning off by itself but i already brought it to a technician but he still did not fix it. I'm thinking right now what is really the problem to this laptop. I wish i found an answer to this forum.

Hey! Having an issue with my laptop not turning on. I was playing a game when suddenly it turned completely off, black screen, no lights, no power down screen. I allowed it to rest for a few minutes but it still wouldn’t turn on. Power supply is good and was previously charging, everything...

My laptop is not starting after switching power on.Earlier it used to happen occasionally,laptop fail to start and nothing comes on screen and slowly starts heating up.I used to switch it of and switch it back on after a few hours,it starts working again.But now it doesn't start all despite...