Good Day, I bought a new 27" iMac 5K. It has the 1tb fusion. I basically deleted the fusion drive for storage and boot off a 1tb Samsung T5. I also upgraded the Ram to 64gb. Everything works fast once it boots up, but if I reboot the screen is just black for like 30 - 45 seconds, then I see the Apple logo and so on. Is the 30 - 45 second of black screen normal after this type of upgrade? I checked the ram in the system and it all comes back working and right?