I was running Mavericks on MacBook Pro (mid 2012 model). I started upgrade to Yosemite. All seemed well on download, and the laptop re-booted to complete the install. The installation screen with OSX logo appears, and progress got to over 90% complete, with "2 minutes remaining" displayed. It remained like that for around 2 hours, before I decided something was likely wrong.
I have started the machine a few times, and by default it boots back to try the install again, and stops in the exact same place.
I have also started the recovery disk (
cmd-R ), checked for and repaired some permissions errors (that looked unrelated), and have also run a full install of Yosemite from the menu, which apparently succeeded. However, the machine still boots to same attempt to complete the install - I'm assuming this is the original upgrade that still expects to be completed.
I have not been in this position with a Mac before, and am not sure what my next steps are:
1) Is there any safe way out of the installation loop?
2) If not, is there any way I could connect a USB drive in recovery mode, so I can retrieve some local files before wiping the disk for a complete re-install?