Sorry, that's custom DELL than, it won't work with Your MSi motherboard. The only way how You can make it work and hope for the best, is that they set the power pins, reset pins, hdd led pins somewhere close in that interface, and rip it out with scissors, and solder standart pin endings to the cables. It's a bad idea. Get a new case, that's Your best shot.
You'd need to find the schematics for that custom iDE cable that powers standard power/hdd/speaker and modify it. I do not suggest doing that, since You don't have extra "ide" hybrid cable.