just got my new 27 inch 5k imac. 1 tb ssd 4,2 GHz i7 and radeon pro 580 gpu. I have the new wireless Apple keyboard with numbers (the large keyboard) snd the new magic trackpad which i ordered along with my brand new 5k iMac. I have enabled filevault on my imac and it took about a day to encrypt the whole disk but that was expected. What was not expected however was that the imac now sort of hangs during login. When i first move the mouse and start to type type in my account password after I reboot the computer it takes a few seconds before the keyboard and mouse responds even though the boot process has finished. To explain better: I reboot, and when presented with the logon screen i move the mouse and type in password and this is when the mouse and keyboard is non responsive for a few seconds. So when i type in my password the first few letters are not registered before the keyboard suddenly reponds. Extremely annoying! When i turn filevault off everything is perfectly fine. Ive tried a complete reinstall of sierra osx and have also run the disk utility to search for disk errors but nothing helps. I seriously consider returning my new imac because of this issue, but as i have no idea whether it is a hardware or software related issue i do not know if a replacement iMac will even fix the problem. Anyone else with the new iMac having the same problem? Will a replacement iMac fix the issue for me?