Why are the screws of the Macbook Pro blue on one side?

I just bought a new early '12 Macbook Pro 13" and was about to open it to swap that pesky HDD with a fresh SSD. After lifting the first screw I saw that the screws are blue on one side.

I'm asking myself why they are like this. Is that a measurement to detect if the warranty has been voided? If yes, how can I still replace the HDD without voiding the warranty 'further'

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2 Answers

It's a threadlock. Or 'screwfix' as you may know it.

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Apple use Blue Loctite on most of their screws to keep them in place and also so they can detect if they have been moved. (warranty)

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