Hi I've build 4 PCS in my lifetime so I mostly know what I'm doing .But last week I started building a gaming pc for a mate and I can't work out where one of the cables goes any help would be appreciated the cable comes from the front of the case where the power botton/USB ports are. Here's a picture of the cable. The pc turns on fine and I've tested everything and everything seems to be working okay so I'm a bit confused.
https://drive.google.com/folderview?id=1l7AboqBFSIDGlV8P9DXTsl1g-by6E3v7
https://drive.google.com/folderview?id=1l7AboqBFSIDGlV8P9DXTsl1g-by6E3v7