This is so strange...as I always do when I receive a new Apple product I go to my support profile and register it for warranty purposes.
With my new iMac 27" late 2015 model, it says my serial number doesn't exist, I've been passed between 4 different Apple advisors and they don't know what the problem is. My serial number is the same on "about my iMac", under my iMac stand actually imprinted to the iMac, my iMac box and my apple order invoice.
It just does not exist at all on Apple systems. Has anyone else had this problem ??