I just received a brand new Sherwood Newcastle R-863, I would really love to give it a listen... The thing is, it won't let me. As soon as I turn the thing on, it shuts off. I have a feeling its a problem with the power input, but really am clueless, nothing in the manual hints to this problem. Any help? I have a TEAC DV-10d dvd player hooked up to it, and a paradigm speaker pack.