We have had Dell Latitude E6500 laptops in our ofiice for more than three years. When we powered them up on Monday, the sound now crackles - we use docking stations with external speakers. All of the laptops are doing this. What do we need to do now?
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If all of them started doing that, all of sudden, I would look arounf for something that generates (electrical) noise - elevator, microwaver etc.
Get one of these (with the docking station and speakers), and connect it at your home.