Hi all, For the past month or so, my Macbook Pro has been emitting this one really strange noise almost as frequently as three times a day. It's actually pretty startling because I keep my volume high for my music and then suddenly the noise will happen and I'll get really scared. It only lasts for about a second, but it's the same noise every time and it's a combination of sounding static-y and electronic at the same time, if that makes any sense at all. Hard to describe. Anyway, what should I do? Does it mean I have some sort of virus or something? Because I got this laptop from someone who works at Apple, I apparently can't just bring it into an Apple store for repairs, but have to ship it to California's HQ directly so I'm hoping to avoid sending it if not necessary. Thanks in advance!