I did a search about hiss, but all I found were threads about older models. Main problem: Earbud headphones plugged into the audio jack have a loud hiss unaffected by volume. According to the older thread it only effects low powered headphones and I think this is true for me as well. The problem is that I need noise canceling earbuds. Anyway, Do I have a defective computer or is this a known issue? Minor annoyance: When I plug in or remove the headphones youtube videos will pause for a moment. I just tried watching some garage band tutorial videos and the same thing happens. Is this normal? Thanks. Irrelevant venting feel free to skip : I'm bummed about this. I haven't used OS X since my g3 pismo died in '05. Using it again is so awesome and I love the trackpad. I really hope my system is bad and it's not an audio issue they haven't addressed in 3 years! This is pretty ironic. I got rid of my old laptop because the fan noise was so loud, so I get a super quiet Apple and the hiss is worse than the fan!