Pre-built vendors (HP,DELL,Lenovo etc) don't use standard Mobos, you cannot expect the header and cables to match, but this shouldn't stop experience builders, a LED no matter where it came from is still powered by a - and + pins, a power button is still two pins. Do you have the expertise to break down what each pins is connected to and do matching? Own a multimeter? If not either call cousin Geeky or use a standard enclosure.