Xbox turns on and shuts off

I have an Xbox that beeps and turns on and then turns right back off. Just stopped working didn’t lose power or spilled anything on it. I have replaced the power supply, the power cable, the front control area thing that has the power button and it’s still doing the same thing.

I also have checked the motherboard to see if there’s any corrosion anywhere on the board and I couldn’t see any. Any ideas what’s going on with the xbox?