I recently built a brand new computer; only re-using my HDD with windows 7 on it, and my HD Radeon 6750. After installation, I plugged in all of my peripherals, and everything works just fine; however, the volume of my speakers is extremely quiet, and I cannot manually turn them up using the device that came with my Logitech Speakers. The only thing that seems to work is the sub-woofer. I can manually turn that up. The two front speakers remain quiet, and I am unable to turn them up. My MB utilizes Real tech 7.1 on-board audio. I also have double and triple checked that the wires are plugged in to the correct holes in the back of the MB. Do I need to go out and buy a sound card just to have audio?