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I'd plug in the amp, with no sources connected to it (with speakers, of course) to see if there is hum, then connect one source at a time, as noted, until you find where it is coming from. If it hums with no sources, your issue may be with the amp itself, or the outlet in question is not...

Do a search, I believe there was a thread about humming plaguing some recent Rotels (I don't remember if it was Rotel or another manufacutrer, but I believe it was Rotel). Next question - The FIRST thing you need to disconnect is the cable box. If the hum goes away, you could have a ground...