Hi, i reset my late 2012 rMBP a few weeks ago and made a clean install without restoring anything (Yosemite) and now every time i start my computer it keeps asking me for my iCloud password. When i put it in, nothing happens and it asks me again. If i simply click "cancel" it appears once more. finally i hit cancel another time and it goes away. iMessage and everything works fine though ... so i dont get what the problem is. any idea?