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!