After grounding the computer after a while, the interference resumed

Andrew asks:
Hello! I ground the PC in a private house under a piece of fittings sticking out from under the stairs with a bang. But 3 months passed, and my PC again began to work inappropriately as it did 3 months ago (that is, microphone interference, a strange buzz). What is the problem, do not tell me?
The answer to the question:
Hello! Maybe contact with the earth has become bad. The armature rotted or the wire was interrupted somewhere.
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