Audio interference

[nogbad]

I get interference on my stereo when my laptop is connected to my amplifier but only when my mains charger is connected to my laptop. I have tried three new chargers and a different amplifier so is the problem with my laptop and how can I cure it?

 

[Big B]

How about the cable from the laptop to the amp? Did you replace that?

Have you updated to the latest drivers for the sound card?

Are you using the speaker output or the Line-out?