Prohibition Sign on Start Up
iMac won't start up and it shows the "Prohibition Sign" on start up. I went into recovery mode and to disk utility and it doesn't show my fusion drive and it shows no information what so ever. Can anyone help me?
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You won't see the Fusion Drive under Disk First Aid, You'll see the discreet drives (HDD & SSD) that combined make up the Fusion Drive set. If you can't mount the drives then you have a deeper problem!
At this point you'll need to use the command line interface of Core Storage following this guide: Fixing a Mac Fusion Drive that Disk Utility can’t erase
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Sounds like your fusion drive has failed.
Try to get ahold of another mac and make a bootable thumb drive for any OS X installer. See if your iMac will boot from this thumb drive. This would verify if your disk has failed or not.
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