My PS4 turns on and then turns off after a second
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?