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crackling sound

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    Weird ratling sound coming from back of PC (most likely power supply)

    For a while now (maybe around 3-4 days) I have this weird ratling/crackling sound. It's coming from the back of my PC. I honestly don't know what causes it, because it happends very infrequent. I can go hours without hearing it once and then suddlenly I hear it 3x in a row. At first I thought it...