Logic Board Reset?

Joined
Mar 14, 2007
Messages
852
Reaction score
22
Points
18
Location
Marlton, NJ
Your Mac's Specs
3.06 iMac i3|12GB|500GB
So a little while back, my macbook was making this weird buzzing noise, followed by a nice long CLICK. Obviously, I was concerned, so I brought it to the Apple store. They didn't observe the problem, but they did reset the logic board, and I have yet to hear a peep from it since (knocks on wood). But I couldn't help but wonder:

1) What is the logic board?

2) How would resetting it help solve my problem?
 

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