Buzz from Earphones

[imacintel]

What could this be?A bad SMC chip? That is what Apple says it could be, but what else could bethe problem? I have tried the following that Apple told me, but it remains:

External Speakers(even louder buzz)
Other earphones
Checking for debris

Everything is fine.

Has anyone else experieced this.

It has been here before the SMC FirmWare update.
About to run apple hardware test.

PS:Could it be something on the logic board?

 

[funkychunkz]

I used to have a buzzing sound from my monitor speakers (hooked up to the line out jack on my PM G4). I think it was dust on the logic board and PCI card, and I haven't heard it in half a year. Make sure to update all of your system software too.

 

[imacintel]

I used to have a buzzing sound from my monitor speakers (hooked up to the line out jack on my PM G4). I think it was dust on the logic board and PCI card, and I haven't heard it in half a year. Make sure to update all of your system software too.

Apple says it could be much more serious. A SMC chip, part of the main motherboard, chooses how much power goes to what part of the compter. For example, when you choose less brightness on the screen, it gives less power to the backlight. and screen. It may be giving too much power to the headphone jack, or not enough.

They say is extremely likely it is a hardware problem.

It also makes a noise like a key cutting sound.