Normally, wether the hard disk is working or not, it does the usual startup chime. Then, about a week ago, I noticed a strange, very feint hissing noise coming from the speaker. I don't know for how long it had been doing this. Then, yesterday (or maybe the day before), I had tried to boot it about 10-20 times. One time, never before, and not again for a while, it went:
a bit like an airport anouncement. It did it straight after power on, right before the chime (it still chimed).
Today, it did it again twice (not twice in a row, but fairly close together). It always makes exactly the same beep.
Why is this? I know macs should never beep on startup. Only disrespectful PCs do that! So why did it do this?
It's not a problem as such, I'm just intrested as to why it does it and what it means.