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Static noise when using the trackpad on mains power

HP Recommended
Elitebook 840 G6
Microsoft Windows 10 (64-bit)

I have an Elitebook 840 G6 which is about two months old. I’ve noticed a static type noise coming from round the centre of the keyboard while using the trackpad. It’s very noticeable while the laptop is connected to the mains. The noise is still there while on battery, but it’s very faint.

I've used the G1 and G3 versions of the 840 over the past few years and not noticed it on these. 

Any ideas what causing this and what the fix is?


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