I bought this PC 2 months ago. Yesterday, I had to transport it by car. Even though I packed it in the original box with foam, when I tried to set it up again, I noticed that this cable, which I had secured with electrical tape, was loose. I'm sure it wasn't loose before.

I know it's some kind of power cable, but I don't know where to plug it in (I'm not a hardware guy).

Note: The PC is turning on and functioning normally. I don't know if it's related or just a coincidence, but my headphones that I usually connect to the back stopped working.

Can someone shed some light on this?