I've recently been experiencing a buzzing noise coming from my computer, through my speakers. This noise is consistent and increases/turns scratchy when I scroll a page. I've never experienced this problem before and the setup is the same. I was told it might be a mains feedback loop and so have plugged both the computer and amp directly into a wall socket but this has not resolved the issue.
My setup is a Macbook Pro connected to a Marshall AS50R acoustic amp (second channel, aux connector) via a mini-jack-to-phono lead.
Any advice is greatly appreciated, thanks.