Cant remove cable from motherboard

[maneil99]

Hey all, I have a x58m and I'm trying to remove the cable attached to the circled input here http://i.imgur.com/FYlwZ.png
Any help would be great thanks! THe cable seems to be two seperate pieces with 1 joined wire

 

[helpstar]

on the picture you can see a rectangular on the right side. You have to push the clip of the connector to remove it from there.
I know you have a 8pin but on the following foto you can see the mechanism:
http://www.mechbgon.com/build/ATX12V.jpg