Update your post to include full system hardware specs and OS information.
= = = =
And I will add and ask follow on questions:
Do you have the applicable User Guides/Manuals for motherboard and case?
This:
"I had a motherboard like any other motherboard on the f audio, and I changed it because it got burnt and I replaced it and I have these cables, I'll post a better image tomorrow"
Reference: "post a better image tomorrow" - please do so indeed and include photographs of both ends, connection ports/plugs, etc..
The initial posted image appears to me to be crimp on cable splices. Used for repairs to damaged or cut wires. Likewise not sure as mentioned in Post #2.
Not standard component/motherboard/case connections.
What happened to cause the motherboard to be "burnt"? Circumstances, events, actions?
And regarding that "pre-built" case provide as much information about the case as you can.
Source, vendor, any labels, stamps specs ,etc..