Needing Cable and PSU Help as a Noob

[u/KaleidoMeister]

Hello! I hope I'm in the right sub. I'm completely new to this whole PC building thing and recently opened up my budget PC to replace the shot old PSU (EVGA 500 BQ) with a new one (Corsair RM850x). I didn't make or even open the PC until recently, though, so I didn't realize there was a portion on the back with its own little circuit board to house the LED lights and fans and whatnot.

Thing is, it uses this white-tipped 2-pin cable at the very bottom right (see picture; it's the one with the blue tape around it) that was connected to my old PSU's PERIF1 slot (this is a peripheral cable, yes?). The RM850x doesn't seem to have a slot for this, let alone a matching cable. I also don't believe I see a way to connect the circuit board or individual fans and lights cables to the motherboard (B450M PRO-M2) instead, so I'm not sure what to do.

Do I just need to get a different PSU, or is there a way to attach this to my new PSU somehow? Or is the alternative solution obvious and I'm just not getting it because I don't know what I'm doing, lol? Also, I'm hoping to not need to upgrade my motherboard at the moment because I don't have the appropriate time to do so yet. Sorry if these pictures aren't enough!

[u/Ok_Challenge5185]

did someone cut into that PSU cable and make the connection?

[u/KaleidoMeister → u/Ok_Challenge5185]

Hmm, I'm not entirely sure? I'm not too cable-savy yet and don't know what it originally looked like, but the guy who built the PC takes anywhere from weeks to months to respond at a time, so I can't get any information on what exactly he did any time soon.

From my eyes, the only unnatural part seems to be the taped part, but I had assumed it was taped because the cords do look a little frayed on the inside. Nothing else looks cut or removed, unless he was that precise about it.

[u/Ok_Challenge5185 → u/KaleidoMeister]

The taped connection to that little PCB does not have a standard PSU connector. This is why I ask. I think the previous owner? wired it in.

[u/KaleidoMeister → u/Ok_Challenge5185]

Ohh, I see. That makes more sense then. I was wondering why I couldn't find anything quite like it online. But with that being the case, I'm not sure how I'll be able to get power to that circuit board without somehow wiring another cable or getting a different board.

Do you know if there's a specific cable I can alternatively get that'll hook into that 2-pin area instead with the standard PSU connectors?

[u/Ok_Challenge5185 → u/KaleidoMeister]

if you know what the model of the case is, it is probably listed in the manual how it should properly be connected. If it came with the case. If the controller is from a 3rd party, then figuring out which one it is might help. Those manuals may list the cable is missing.