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@wee-eddie wrote:

 

What is obvious is that if you lift it up or push down on the casing it stops instantly.

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Sounds like a simple mechanical case vibration. If not the case itself, a "spinning" part like HDD or Fan is likely cause. Are all the case pieces snapped into place ... are all the screws tight?

Insert a kitchen-cabinet bumper (or black electrical tape wrapped around a piece of cardboard) between the case pieces that are vibrating.

Thanks for the advice. Will have a good look and give it a try

Cheers

Eddie