Ps4 works but shows no picture?

My Ps4 no longer shows a picture but everything else works. You can hear the background music and the button tones from the controller on the television. However, no picture is displayed. At first I thought that the problem was with the HDMI cable, but that's not the reason either. I also tried it with a total of 3 different televisions. But always the same problem. At the beginning there's a picture for about 2-4 seconds, but then it disappears again.

What can be the reason?

Did you change the hdmi cable?

Yes, I've already tried several.