I got a PS4 Original Model from my neighbor. It was working fine but I wanted to completely clear all that data off so I did a Full Initialization. and when it finished I just get black screen.
I can unplug it for 10-15min then plug it back in. And I can get the PS logo but it goes to a black screen.
If I unplug again I can get into safe mode and do a full reinstall of the firmware from the website. But same thing I have to unplug for 10-15min to get the PS symbol then black screen again.