Ps4 powering on but noch Signal

Hi everyone,

i got a Problem with my ps4. It starter to Turn Off Sometimes a while ago. Now it wont Show any Signal at all Most Times. Ob very few occasions IT will Turn in and give Signal and function for absolut an hour. Then it shuts down again and No Signal again. I tried resetting it and reinstall via usb but nothing chaged. It got a little hot lately before the issue and i cleaned the Fan a few Times and that helped a little bit.
It doesnt seem to be the HDMI Port for me. Does someone hast a clue for ne what this could be?

Thanks in advance