Let's talk about the background of the problem. You can skip it later. I am a 15-inch rMBP2012. The day before yesterday, I got stuck on the login interface (a rare problem is that after entering the password, the circle turns endlessly. Of course, the system cannot go in ). I just got started with mac and didn't understand anything. I simply used the disk permission repair and disk verification, and there was no problem. So I went to the app store for detection and re-installed it directly. If you want to reinstall the software, you should not go. there is basically no good solution for software problems, except for reinstallation.
Problem Generation Environment: After encountering the above problem, students who use Time machine must have recovered from TM. Fortunately, there was a fresh backup three days ago, here, I like the Time capsule. wireless backup is undoubtedly too convenient. If it is available, there will be a backup every hour. I bought one immediately after the problem occurs, the previous backup was in the mobile hard disk. It should be noted that if you only need to find the file from the TM, you can copy the file from the TM, but you want to recover the entire system (that is, including the system), you need to boot from the system disk to go in, speaking of system disks, they can be attached to a USB flash drive or a partition of a mobile hard disk. I like pure installation, so before the TM restoration, I formatted it and then restored it. This problem occurs.
Cause: There is a lack of recovery partitions, so this problem usually occurs on the full format or new hard disk.
Solution: reinstall the system. "Restore partition" is generated by default. Because the system will be restored during installation, there is no need to wait until the entire installation process is completed. You only need to click option in the first restart to go to TM restoration.