I built my house about four years ago and until yesterday everything was
fine. However, a couple of days ago I started experiencing trouble with my
road runner connection so yesterday a technician came out. He found the
signal strength was too low, and he replaced the cable from their box to the
small box on the side of my house. He also replaced the splitters in the
attic as I got digital cable installed a couple of months ago and the
splitters didn't cover the full freq range used by the digital channels.
Said he was surprised it was working.

Anyhow, he gets my RR restored and the picture on my TV's look better than
ever. But, when I went to watch a movie last night I got the all too
familiar ground loop hum. I disconnected the cable input immediately and
the hum disappeared.

I'm on my way to the store today to get a 3-prong to 2-prong adapter, but I
was wondering what he might have done to cause this problem? Also,
shouldn't they be responsible to fix it? I called them this morning and
told them of the situation and was promptly told that many people experience
this and there is nothing they can do?

Any advise/suggestions?

BTW, I looked outside where they have their box on the side of my house and
the only ground I saw was a wire going from the box to conduit of my main
a/c feed from the breaker box? Is this normal? Also, is there supposed to
be some kind of ground at the other end as well. There big ugly green box
that feeds several houses is also in my back yard.

Thanks