random ding ding sound from my imac
i bought my first mac on wednesday and have really good experience with it so far... i noticed that every now and then it makes a ding ding or dong dong sound... can anyone shed some light on this? it happens when i'm using it and it happens when i'm not using i.e. watching a dvd last night it did it twice. the only thing i have installed since purchase is mac office 08 and eyetv 3 software. thanks in advance.
iMac 2.66, Mac OS X (10.5.6)