Cracking noise when starting up MacBook Pro

Hey guys,
Today I noticed a strange problem concerning my MacBook Pro Retina mid 2012. When starting up, a strange crackling noise appears from I think around the left speaker. The noise appears before the white loading screen of OSX. After starting up, the machine works fine. Anyone got an idea where this is coming from and if I should take the machine to the Apple store?
With kind regards,
Jesse

Take it in for testing/diagnosis.
Barry

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