Noise when I plug in my laptop power cord

it's more than probable an earth loop. it's to do with the electrical wiring.

are you using a gang socket ? to split the wall socket into 4 etc ? you might find thats a problem.. but sometimes the laptop adapter itself has issues with the grounding .


http://www.harmoniccycle....sic-15-Star_Ground.htm

you can get things like a ground loop isolator.

the ones I've fixed for others are normally a cheapo power splitter / adapter as the cause of issue.

Thanks alot Fog and Jim for the feedback.  Will give these ideas a try.

The last house we lived in was new and was very noisy. I started to dig. Part of the problem was the power coming into the house. I could wak under the power cabe coming from the pole to the house with an AM radio and it would buzz like a saw. I called the power company, they came out, I showed them, they checked the pole, replaced something there and it got went away (under the wires).. however it was still noisy inside. I dug deeper and found that every ground wire in every receptacle and switch in the house was loose... really loose. I went through them all, tightened all the connections and that fixed it.

You might try running an extension cord, if needed, from an outlet that is on a different breaker and use it to power your laptop, that might fix it.

I use power conditioner type surge protectors where I am now and they seem to work well. The power here is dirty too but it is all underground. I can drive down the road and there is an section of road where I cannot use the AM radio in my truck because of the overhead lines... still, I am sure that is a different issue from yours but noise is noise and sometimes the power company will try to fix it if it is causing you a problem.

J