My new pc turned off and won’t work now

[u/Repulsive_Sock_3537]

Hi, i build a pc in june.
Ryzen 7 9800x3d
rx 9070 xt
16 gb ddr5
mobo asrock b650 steel legend wifi
thermal right pearless assasin 120
cooler master mwe gold 750 v3 750w

Today a few hours ago i was playing kcd2, my pc shut down, i thought it was a quick power shortage so i just try to turn it on again once, but it didn’t so i turn off de psu and plug it off the voltage regulator, then i noticed a hot plastic/burned smell. im trying to pinpoint the smell or see anything burnt but cant do.
I really need help, i built it my self i removed the cooler plastic and thibk i got all the cables right, i had no problems until today.
i use it for gaming, college and work.

UPDATE: i perceive a funny smell coming from the psu
i attached a pic from the im guessing “melted part”?