Hey guys, It was time to format my C drive and instal a fresh clean Sierra. Its the first time sinds i bought this machine i do a clean instal. I own a 2011 27" imac (i5) and the instal is done with an Bootleble USB drive. When i want to do the iCloud part, it tries to make an connection but failed. An unknow error. No code's or what so ever. I am wired to the internet and the same happens when i do it with Wifi on. I can login on icloud just like that using the website. No problem at all. I am hunting this issue nu for some hours but getting a bit down. I am used that its all click and play with Apple. Without iCloud its just a computer, not my computer. Any thoughts peeps??