I have inherited a magnavox 37MF231D/37, besides the well-known problems of the tv turning off randomly and having the trouble with the set powering on, I also have no manual and am having trouble deleting channels that the autoprogram has selected. Can anyone help me with this problem? The remote will not let me arrow-down to "preferred channels" and I don't know why. Also, live customer service won't help, I tried them and they had no answer. read full review »