The power button on my ps4 pro kills it

the power button on my ps4 pro kills all power to the system, it’s not like when you hold it down it beeps and powers off, it acts as if the power cable had been pulled and refuses to power on until I unplug and plug it back into the wall, I don’t know why this happens the power button does not work for turning the system on it just kills the power, how do I fix this?

(edit) I have not tried replacing the power button and have only opened the console to replace the can and thermal paste, I did not do this before opening the console and noticed the board for the power light has melted, no damage to the motherboard just the lights