PS4 Dead Except for Eject Button

Actually it's a used unit which I have very little info about what happened to it. I have cleaned the whole unit and like I said there is no signs of any physical damage on the motherboard. My voltage tester screwdriver shows there is power on the button itself, in fact it shows power everywhere on the board. Is that normal? I've repaired quite a few PS4s and this is the first time I've come across this fault.

Try scratching the layer the gold conductive plate beneath the power switch. A known problem with the early units is the capacitive buttons. That gold plate gets some type of problem with the coating and will not allow it to power on, and sometimes it seems possessed and switches itself on and off. All you need do is lightly scratch the surface until it is uniformly shiny. I've done it to my old unit and it worked a treat. Then my daughter whom I gave it to, had similar issues as yours. Did it again a viola works again.

I'd like to know though before I try that solution. Did your PS4 still power on when you tried to enter a disc before you scratched the touch button, or was the drive completely dead?

Did it ever get fixed?

please answer that. I have same problem