My PC shuts down 2 seconds after the electric start

[Bagavah]

I tried to start my PC without any device connected to the motherboard
(SSD / Graphics Card / RAM) Same problem impossible to turn on the PC.
To know: The fan starts to turn well, the rtx logo is well lit as well as the cpu. Then a clean cut.
Power supply out of order? Motherboard HS? CPU out of order?
Has the power supply gone into safe mode?
Thanks for your help.

[Bill_To]

Hi

Good troubleshooting steps.

First I would contact HP Support for factory service if your PC is in warranty.

Possible component problem with the power supply, motherboard, or the CPU. I have also seen this happen with a bad top or front panel power button. Disconnect the power button from the MB header. Short the power pins using a screwdriver on the MB header to see if the system will turn on and stay on.

I would temporarily try a different power supply by connecting MB (24 pin) and CPU (4+4 pin) connections. You would need to connect power to graphics card or try a different graphics card if you have a "F" CPU.

Same problem means you are looking at the motherboard or the CPU if the power button is not the problem..