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Black screen issue

Hp Z400
Microsoft Windows 10 (64-bit)

I have a hp z400 workstation that turn on but gives me a black screen with no beeps, i tried to remove all rams but still no beeps but when i did removed the cpu it gives me 3 beeps that means no cpu installed.i did replace the cpu with other one but still have the same issue. So i suspect the psu or the mobo.
Btw i did replace the psu with a non compatible one and it gives 4 beeps that means a power failure.

I tried 3 different gpus but still the same.
So the mobo detect a bad psu and detect no cpu installed but why she didn't gives beeps when RAM is not installed.
So is it a bad mobo or a bad psu.
Sorry for my bad english and plz help me to solve this problem.
Specs
HP z400
6gb of ram
475 watt psu
Quadro 2000
Xeon w3565

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