I have MB 13 2.0 for three months. About two weeks ago when I was using my MB I heard a strange noise (like a tractor) from my right internal speaker. It was before the 10.4.10 update but the signs are the same. When I plugged on my headphones everything is ok, when plugged off sometimes the noise is immediately on and sometimes after few minutes or longer or when I do some action or click somewhere. I reinstalled system, did all updates but it still doesn't work property. I run SuSe LiveCd but the audio system wasn't installed so there wasn't the noise. So I guess it's a software problem. Anyone knows what's wrong?