Cannot find the boot disk

End 2012 17 "iMac with 1.12 GB Drive El Capitan Fusion running.  When I turn on the iMac, I get a black screen with white text that tells me to insert the bootable disc.  If I press the Option key while powering and I select the Macintosh computer hard drive starts very well.  Any ideas what is happening or what I need to do to solve the problem?

Sounds like something crashed. See if you can boot to the recovery (command-R on startup) Partition and select disk utility and then run First aid. If you cannot start the recovery partition, chances are that the player broke down.

Tags: Mac

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