
If you ask any seasoned PC builder for advice they'll likely tell you to buy a power supply from a reputable manufacturer. It's the done thing, and if you've ever wondered why you need only look to this absolute disaster of a PSU posted to r/pcmasterrace by user RedditCringe990 to understand.
Just a quick warning before we get into this: Don't open PSUs for fun. It's possible for a PSU to store a significant charge even once disconnected from the outlet, and the risks are absolutely higher with a cheaper PSU with no protections or shoddy workmanship. Don't then go and rip open individual components from inside your PSU, either.