I have heard this noise several times and I have no clue what the hell it is. I have looked right after it and I see nothing on my screen (no pop ups, badges or anything). It sounds like a chime that starts low and goes a bit higher and lasts for 1.5 seconds roughly. It's like someone has signed into AIM as if you were on the computer. I do have beejive signed in but nobody has come online or gone off. Also, it was not running. Only my home screen was up in all instances. I am baffled as to what the noise is. It's a happy noise, nothing bad - I just want to know where it's coming from. Any ideas?