I have an HTR-530 receiver - Part of the HT-s780 system. I love it. Sounds awesome and I am only using 5.1 as I used the two rears for my other home theater set up. Anyhow, it stopped the other day. Will not power on. When I hit the power button I hear a lite thud at about 2 second intervals thru the sub, but that is it. No Display, nothing. Any ideas. This was not abused and not cranked up (to my knowledge).