I had the same exact problem. Apparently, I had opened the case and closed it again without paying attention to close it tightly. Since the Aluminum cover has complex surfaces, it seems you would need to take extra care that the cover is tightly snug against the case. Otherwise, a protruding small cylinder on the cover inside, would not push against a sensor inside the case to “tell” the workstation that the cover is closed. In other words, take your workstation to a very well lighted room and make sure that there is no opening in the seam between the cover and the case. If you see an opening in the seam make sure you push the cover against the case and you should hear a click of the lock. Also, make sure that when you remove your hand there will be no opening in the seam. That should solve your CPU’s fan noise.
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