My story might help you out. We had the same problem here in my house. The internet went out and we got the TV cable ok, but all the HD channels were out, a lot of pixelization, and cable stations further up the numbering scale...like channels 50-100 were out...these were standard, not HD
I tried everything on my end, but nothing worked. My story is I remodeled the place. We have 12 cable drops and 14 network drops throughout the house (condo). I have two cable expanders in the closet and a 24 port gigabite switch...I almost forgot: 14 phone drops with 3 lines each (personal, business and fax)...so there is a block in the closet too.
Anyway, the Comcast guy shows up. Luckly he has some experience. The cable signal is way, way below what it should be at my main termination (ie: cable from comcast to my expansion boards). He is surprised I am getting any channels at all, and, it explains why I have no internet.
We finally trace down where the Comcast demark is and he finds that some hack had recently rearranged all the cable connections to the condo units....basically had cables going into way too many splitters, thus too much db loss. My unit has a one to two splitter.
On one of my lines(cables)the comcast tech found voltage...how that happened, I have no clue...but something happened....so apparently one of my in house lines is picking up voltage from somewhere...any it's enough to get your attention when you touch it.
Once the hack problem was corrected, we sent up to my place and removed the cable that had voltage (I wasn't using it anyway) and reduced the number of connections to just the three TV's and cable boxes that we had.
That fixed the problem....I am pretty sure he had them boost the signal too, just in case.
As a coincidence, all this crap happened when a new owner moved in and, I suspect he had some hack cable guy (Datsun pickup)do his cable work.
Thanks for the input :thumbsup: Comcast has been out 3 – 4 times now and has basically washed their hands of this. Their position is that this is an electrical issue not a Comcast problem.
I just want it fixed – the customer is driving me nuts with this.