Surround Sound makes buzzing noise out of speakers?

Question

I use my laptop as a DVD player and plug it into the front audio of my reciever. It works fine UNLESS i have the power plugged into my computer. As soon as I plug in the power supply to my laptop a large buzzing sound comes out of the speaker. If I run my laptop on battery the sound comes out fine fromt the entertainment center. Any ideas. Sounds like some sort of grounding problem to me.

Answer 1

its easy to solve! listen, your home electro. doesnt have earth connection, and you should make a bridge for electrons to leave your laptop. you need a cable. make both sides bare, and turn it, around the power cable, where is going inside to your laptop and its uncovered(bare) and its metal.(i hope you get me) and connect another side to somewhere that is connect to ground, like radiator(but in painted part)or something like this. please contact me if you need more info.

Answer 2

You have a ground loop.  Adding grounds like the previous poster suggested can sometimes help, but usually makes it worse.  You need a single point of ground, not a whole bunch of grounds.  Adding one might help though.

A simpler way to get a ground from your laptop if to look on the back where the serial and parallel ports are.  They have screws on the sides to hold the connectors on them  If I remember correctly, they are standard machine s***w size 2-56.  Go to home depot or lowes and get a s***w and the needed wire to ground the laptop.  I personally do not think this will work.  

The only way I have fixed laptop based ground loops is lifting the ground pin on the AC plug using one of those 2 prong to 3 prong adapters, also available from lowes and home depot.  This is not a proper fix but it does usually solve the problem.