Ps4 goes off again immediately?

My PS4 starts up briefly and flashes blue for 5 seconds and then goes off again.

I saw the problem, I think. If I press firmly on the left side of the PS4, it stays on and glows white. When I let go it goes off (once it even went a few minutes before it went off again).

What is the problem? I do not understand that

If the PS4 only runs when you press the button, the button mechanism is probably broken.

First of all, thanks for the answer. I don't mean the button, if I press firmly on top of the housing (where the green plate is) then it works