Plug in the wrong place?

[mr wolf]

While trying to install a new graphics card I had to unplug a cable.

I am not sure that I put it back in the right place.

There are 2 sockets.

One reads "jp7 spdif"

The other "jp3 usb"

I have tried the plug in both sockets, but nothing seems to be wrong either way.

Where should I put the plug?

Thanks.

 

[GwizJoe]

What does the other end of the cable connect to?