Model A1502 / 2.4, 2.6, or 2.8 GHz dual-core Intel processor / Released October 2013

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no entry sign on OS reinstall

Did a reinstall from internet of mountain Lion and now get no entry sign...

Update

Btw, the disc appears fine, in target mode it can be booted from by another computer...

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Did you enable a firmware password? What do you see: A blinking question mark or a do not enter symbol?

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Its a do not enter sympbol

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Chosen Solution

Do you have access to a second mac which has a Thunderbolt connection and a Thunderbolt cable?

I think you'll need to scratch the drive and re-install the OS. By leveraging the second Mac we can setup your system like a HD to it using Target Disk Mode.

The other option here is to setup a USB thumb drive as a bootable drive using the other Mac system and installing on it the OS installer. Here's the steps for that:

  • Get a USB thumb drive (16GB or larger)
  • Download the OS installer from the App Store, make a backup copy
  • Then create the GUID partition map on the thumb drive and format the partition with Mac OS Extended (Journaled) with Disk Utility.
  • Run the OS installer and install the OS onto the thumb drive.
  • Once done, copy to it the copy of the OS installer.
  • Restart your system holding down the Option key so you gain access to the boot manager select the thumb drive.
  • At this point you should be able to reformat the drive using Disk Utility on the thumb drive and using the OS installer on the thumb drive install a fresh copy of the OS.

Do make sure you are connected to the internet as there are some updates your system will need.

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Most Helpful Answer

When you see a circle with a slash symbol instead of the Apple logo, it means your Mac couldn't find a valid System Folder to start up from.

Your machine shipped with 10.9 and will not boot from a lessor system.

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No, it's a 2012, and automatically reinstalls OS 10.8 from the internet.

After the install is complete it won't boot.

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