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Is it coming from one particular input device or all of them?
Do you have a cable TV connection? They're a common source of noise.

If you aren't already using one, get a high-quality surge-suppressor power strip which includes power-line filtering and CATV cable protection, too.

Is there a radio transmitting tower nearby? They can cause nasty interference problems. Shielding hifi electronics against that can be quite expensive.
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