Clicking/chirping sound from MBP whenever it's plugged into external display

sounds this

http://www.youtube.com/watch?v=0zac9o3z4dc

not video have same problem. comes , goes, maybe couple times hour.
happens when use external display.

know why?

 

dextor said: ↑

sounds this

http://www.youtube.com/watch?v=0zac9o3z4dc

not video have same problem. comes , goes, maybe couple times hour.
happens when use external display.

know why?

click expand...

the pattern suggests drive read/write activity, don't know why you'd hear when using external display. strange!

 

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