PS4 not powering on only inject button bee

Hello, I have a PlayStation 4 1215a… I just recently got it… when I press the power button nothing happens but when I pressed the inject button it beeps… luckily I had another PlayStation 4 1215a with a brand new power supply… I swapped it and nothing happened… I also took the power supply that was in it and put it in the one I had and it worked fine… so it’s not the power supply for sure.

Let me know what you guys think might be the problem.

Thank you!

You could try replacing the button for the power switch