Mac Pro making 'breathing' sound

[am1971]

Posted this a while back on the Apple discussion forums but got no real help. Hoping someone here can point me in the right direction.

For the last couple of days my Mac Pro has been making this weird sound, not too loud, it sounds a bit like a hard drive spinning, in a rhythmical way.

It's almost like it's breathing. It's one of those noises that once you start to hear it you can't not hear it. It's slightly intrusive as well as I do audio work and it can be picked up in the background.

Would anyone have any idea what this might be? I haven't added any new hardware or software in the last few weeks, it's not a CD or DVD spinning in the drive, so I'm struggling to try and figure this out.

Audio clip - http://leftback.info/mac.mp3

Any help much appreciated. Thanks.

 

[kpg]

any response?

I was just wondering if you ever got a response to your question or resolved the problem? I'm having the same problem...
thanks
KPG

 

[OddThomas]

well let me be the first to say it.. your computer is possessed. sorry.

 

[Dr.Pants]

To me, it sounds like a fan is spinning up or the optical drive is confused. Try starting the machine with the optical drive disconnected. If the problem persists, find all the fans in your case and re-plug them in (if you can).

 

[MacAndy74]

I've heard a DVDRW Drive make just the same sounds.
Try this: Eject the DVDRW Tray and then see if the sound keeps happening.

 

[Insulin Junkie]

well let me be the first to say it.. your computer is possessed. sorry.

When I was a kid I dreamt that Captain Granville from Voyage of the Mimi possessed my Macintosh Performa... it was real creepy.. he had a red terminator eye and his face took up the whole screen

 

[Eidorian]

It might be a cat.