My friend recently(Four days ago) got a new system comprising of AMD Phenom 550 B.E with a Biostar A785GE motherboard & 5.1 Creative Inspire Speakers. The output from the speakers was fine for a couple of days but since yesterday the Rear Left & Rear Right speakers don't show up when playing 5.1 channel videos. Even if they produce anything its just a faint voice & that too is really distorted. I tried with reinstalling the drivers but to no avail. All the wires are plugged in securely & the set is brand new. What should be done?