Boyo has a good idea too. If we knew what Brand and Model your case is, there might be a more specific solution. You can buy front port assemblies for Lian Li cases at the site above site and for Antec and similar from the Antec store. If your case is not a big name, then pix of both ends of the cable and the front panel PCB (circuit board) would help a lot. That is if you want a tightly specific solution.
.bh.