Yes, of course. Don't worry, it's no problem. Unfortunately, however, you're not quite right yet, but you're getting closer. My motherboard has two power LED connectors. My case has one which has 3-pins. The 3-pin one on my motherboard is separate from all the others, making me think it may be for another purpose somehow, so I was asking if I can use that 3-pin connector or not, and, if so, do I need to cap the 2-pin one at all.