Hi, I can't believe it I did replace 3 MacBook Pro 2016 13" due to issue and I did skip the 2016 model and replaced it with MacBook Pro 2015 15" that was wobbly so I did change that one also to a MacBook Pro 2015 15". So now my second MacBook Pro 2015 is making some kind of click sound during startup. I can only hear it some times when macOS running but not as "strong" sounded as it is during boot. In MacOS I can't reproduce the sound, I have tried increasing and decreasing fan speed, stress test SSD and also some GPU stress nothing makes the sound come back. I can only reproduce it during startup if I use the MBP for some time maybe 5min and then turn it off and then boot again after like 30 sec I can hear the sound - it's appearing when you can see the Apple logo and a load bar, when the bar is about 50% then the clicks sound. The click sound don't appear every boot around 50% of the boots I can hear the click sound. I have tried to reproduce the click sound during boot when the MBP runs on battery and it do seem that I can't as far as I can tell. So the click sound only happens when I have the charger connected to the MBP during boot. And also some time when I'm using macOS. Why does this keep happening to me? How can I get 5 MacBooks in a row that haves issues directly from the box? What is the click sound? I don't know what it is but it's not normal. Here is a video of it, you can see during the load bar when the click sounds appear.