Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
This seems to be a Yosemite issue, not just 12" MacBooks.

I know various people over the last few months that have purchased new Macs and during setup (usually FileVault stage) have run into issues. These have been MacBook Airs, iMacs and MacBook Pro Retinas.
 
This seems to be a Yosemite issue, not just 12" MacBooks.

I know various people over the last few months that have purchased new Macs and during setup (usually FileVault stage) have run into issues. These have been MacBook Airs, iMacs and MacBook Pro Retinas.

Yes, this is a Yosemite issue. I have setup four or five 15" rMBP's since Yosemite's launch and each and every one of them hung on Filevault setup. All required an imaged flash drive and a fresh install to get past the screen.
 
my gold is flawless:
KvMb1jn.gif
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.