Chosen Solution
My PS4 turns on , blinks blue once and then turns off after a second. I checked the power supply. It seems fine, I get 12V from the power supply. I opened the ps4 up to change the thermal paste. Not my first time doing it. The ps4 worked before disassembly, but does not work after putting everything back. Anybody knows what it could be? APU?
Seems like FW issue (in my opinion). Either bootloader can’t load from HDD, or it is broken. In first situation an HDD replacement can save the day. In second having someone to flash your PS4 might help. Not gonna say that it is going to work, but it can be worth a shot.
