Direct TV and digital hum problems

Hello,
I hooked up a digital 5.1 reciever for a non audio bud tonight I donated to him. When I hooked up his Sat box via Roslink I got a high pitch faint but annoying hum thry speakers. I figured I would try dig coax and same result. I lastly hooked it up for Pro logic and no hum but its not digital as I had hoped to give him.
I lifted the ground, checked the ground at the junction amp in basement and all settings were verified.
I am by no means new at this, I have over $50k in my home theater and have done surround for over 15yrs all along being a DIY installer (I am also the nerd everyone calls for help.........and am pretty good at it too :)
My point is that I have tons of experience and just cant figure this out, hope some ideas come my way..........thanks all!