Found the ground loop hum source, how to fix?

The box that the uverse uses however is grounded. This box takes a phone line in and a coax out-
Kooshballa

Kooshballa,

When you follow the ground wire from the phone line ground block where/what does the other end of the wire connect to?

So just for clarification the old Time Warner coax cable line from the street is not used and no internal coax cabling within the house connects to or travels through the old Time Warner cable box. Correct?
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i had a hum induced by an unshielded interconnect from preamp to amp. when i replaced that cable, with another, which was shielded, the hum disappeared.

I am not sure exactly what happens with the time Warner box but the existing coax network in my house is used with the uverse box. The uverse box also has a coax output that feeds my existing cable outlets...this box is grounded so in theory I should be ok...just strange that someone would go through the trouble of removing the ground from the time Warner box.

The uverse box also has a coax output that feeds my existing cable outlets...this box is grounded so in theory I should be ok...
03-14-13: Kooshballa

Kooshballa,

Really? And where is the ground wire from uverse box ground block connected to the main electrical grounding system of your home?
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There is a copper wire (main earth ground) coming up from along side the foundation that the the uvers ground ties into via a copper block. This is the same junction point for the ground wire coming from the main electrical feed into the house as well.