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Before I begin please know I am not an expert by any means.

I have a small home theater which I finished a couple of months ago. I had the same problem with a ground loop hum. My issue was bars going across my screen and slowly moving up. It was annoying. I did the same as you and unplugged each piece, one at a time until I found the problem connection. It was the coax coming from the wall and into my cable box.

I did a lot of research on this... A LOT of research. Like you, I kept coming back to an item called a ground loop isolator. I found them online with prices ranging from $10 to over $100. All of them said they were the best and not to buy anything else. Was hard to figure out which one to purchase. I ended up going into a small 'mom and pop' family owned electronics store here in town and they told me to get the VSIS-EU Cable TV Ground Loop Isolator. This would solve all my problems.

So I went to amazon and found it for sale. Here is a link to it.

http://www.amazon.com/VSIS-EU-Cable-Ground-Loop-Isolator/dp/B0017I3K9M

I attached it between my wall jack and the cable box. It was perfect. All the bars on the screen were gone and I could not be happier.

As far as the isolator messing up the HD signals, I have seen none of that. Everything is crystal clear and the sound is great.

Keep in mind if you do purchase an isolator, that you will need an extra coax cable and that the isolator has to connect in a specific direction. The item I linked clearly shows which side to connect to the wall and which side to connect towards the cable box/dvr or receiver.

Hope this helps.

I had Time Warner's "Road Runner" in both Rochester and Albany and I only had a few outages ever; and I lived in a total of 4 different apartments/houses that had it. It was only 15Mbps, but for the most part, they "just worked".

I moved to Redmond, Wa 3 years ago and the Comcast I have here is faster, but recently there's been an outage every week or two. And there's no excuse for it because the weather is extremely tame here.

Not only that, the Comcast cable installed in my apartment created an infuriating ground loop which injected very strong audio/video interference into my whole entertainment system as soon as you attach the cable line (the issue would spread via shields on other cables, such as HDMI cords, to every single device that was attached). As an audiophile, drove me crazy. Those fancy "Home theater" power cleaning devices didn't help at all. Comcast came out but couldn't/wouldn't fix it, claiming it wasn't their problem. Fortunately, I discovered that if I attach a "Ground Loop Isolator" (Amazon sells them) to the cable line, then the problem goes away. But no one is willing to fix the root issue with my apartment's electrical/cable grounding disparity.

And finally, Comcast makes the most infuriating use of deferred price hikes ever. They jack up various prices after 6 months, 1 year, and after 2 years, using every trick in the book to pull this off, even annoying free trials. And they always get me for a month or two because I am extremely overworked and don't have time to deal with their shit as early as I should. Once you do call them, they'll knock your prices back down, but with various new countdowns until a new price hike.

Did you notice any issues with the picture quality? I haven't received it quite yet, but I've heard some complaints that certain features (On-Demand, DVR, some channels) don't work well after it is installed. I ended up ordering this one, if that matters:

http://www.amazon.com/Viewsonics-VSIS-EU-Cable-Ground-Isolator/dp/B0017I3K9M/ref=sr_1_1?ie=UTF8&qid=1451511010&sr=8-1&keywords=cable+tv+ground+loop+isolator