audio glitch

Here's my computer specs: AMD Ryzen 5 5600 6-Core Processor 3.50 GHz Ram: 16gb Corsair ram Asus Motherboard Rog Strix B550-F Storage: 4tb Hdd/SSD Video Card: AMD Radeon(TM) RX 560 Series I started having problems with my computer shutting off randomly about two years ago and have replaced...

I've never seen this before in any of my computers so I don't really know how to fix it, nor do I know how to describe it really, essentially every 2 seconds or so the audio will kinda glitch, like I can still hear it fine but it's got a weird glitch like sound. but also my cursor will glitch...

I power up my PC but it turns on and same with the case fans but nothing appears on the actual monitor. One thing that I did notice was that the case fans were not running as fast and hard.