My Mac will not start up. I went to recovery mode and made a backup of everything on an external drive. Now the Mac only starts up from the external drive.
I have OS X 10.10, Yosemite. I tried to backup and restore but it failed.
Most of the time my internal hard disk is not mounted. I ran Disk Utility today and got the following message for my HD Error: Partition Map check failed because no slices were found
How can I fix my Mac and make it start without the external drive?
Best Answer
Looks like a disk problem, dying. In the Recovery Partition (start while holding CMD+R), start DiskUtility do Repair Disk. Even when the issue is gone after that, prepare to have the disk replaced.