UK Ground Issue? USB Mic buzzing/hum issue?

Louis Helyes

Reputable
Aug 2, 2015
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I have a USB Corsair HS40 with a mic, I have noticed a loud humming and buzz when I listen to the mic back.
I live in the UK and have three pin plug, it happend last week when I replaced my motherboard,CPU and RAM. It didn't happen before. When I put my hand on the PC case, the buzz reduces, I have tried plugging the PC into a extension lead and straight into the mains. Have tried different USB ports on the PC too. Any help?