Chosen Solution
I’m hearing a buzzing sound while starting the system as well as while playing movies and listening music. But, the buzzing sounds go away if I use headphones. Is there any way to fix the buzzing sound?
Then it does sound like you have corrosion damage. You’ll need to open the system up quite far to look for all of the damage. It might make sense to let a Pro do this than your self. At least it sounds like the keyboard will need to be replaced which by its self is a big job for most.
