Hello, I just purchased a new home theater system, Yamaha YHT-195 and I'm having some serious issues getting the subwoofer and 2 surround speakers that came with it to work, the center speaker plays fine, as well as the 2 front speakers but the sub and surround speakers will not work at all, I'm pretty sure I have all the connections set up properly but I can only get those 3 speakers working. I have the system hooked up to a Sony Bravia 40' LCD. I'm pretty new to home stereos and any help would be great, thanks in advance