Buzzing noises + white lines. 1.) As soon as I connected the power I heard a buzzing sound coming

Question

1.) As soon as I connected the power I heard a buzzing sound coming from the television (near the power supply). 2.) There is a buzzing sound coming from the speakers that only goes away if the volume on the cable box is at full. Even then if the TV volume were to put up past 50% it's audible again. 3.) Lastly there is a large white horizontal 'bar' which traverses the screen from bottom to top. This is most visible when there is a solid background, the darker the background the more visible the bar. Panasonic responded to my email in less than 5 minutes! they basically say that it's my cable box or an issue with my home's electrical... 2nd opinions? Thanks a lot.