pc shut down

Hello i recently getting shut downs ( no blue screen or something ) and the memory rams are remain on. when i try to restart it its not happening and the only way to start my pc is to unplug the rams and plug them again. Also sometimes before i get the crush i get buzzing non stop noise.
I get this crash something like 1 time a day maybe 2 sometimes.Any idea whats the problem?

my pc spec:
cpu: 3700x ryzen
gpu: 5700 xt gigabyte
psu: evga supernova GA 750 W gold (which my previously psu was the same and burnt this march and they sent me new. )
ram: 2x 8gb 3200 mhz G.skill tridentz rgb
motherboard: msi x470 gaming plus max
m2: ADATA XPG s11 512gb