for some reason my MacBook Pro will occasionally make a strange noise that sounds as though an old CRT monitor had just awoken from power save mode... for those of you that know of it.. the only thing i could think of is "twang" to describe it.

is there any cause for concern here? I'm a bit of a new Macintosh user and i didn't know if this is something i should Definitely address while its in warranty, or if its something i shouldn't disrupt my work for.

Thanks for your help