I'm a new member and just assembling a decent system, although I have had stereo since about 1970. I simply don't know if a new power cord enhances sound. Unless the old one was defective. Since reading some posts on the topic I have a question. I know audio and video are different realms, although they appear together in a home theater. So, does replacing the power cord on my tv or bluray player result in either better sound or picture?