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Repair guides for the MacBook.

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circle with a slash thru it

on starting it up it has an apple logo then turns to a circle with a slash thru it like a no symbol. what is this and what does it mean.

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This means it's having trouble loading the OS

What you'll need to do is startup from a install disk by holding down C or Option at startup, then you can use disk utility to verify and repair the drive. If it can't be repaired then you'll need DiskWarrior to fix it, which essentially will fix the boot.efi file that's giving you trouble, it's always worked for me fixing boot issues, if it fails, that means you'll need a new hard drive, and possibly data recovery software if you don't have backups. If you can manage to boot or something, BACK EVERYTHING UP! Your HD could go at any minute with conditions like these. SuperDuper is good for cloning the whole drive, however you can also just copy whatever files you need to an external HD.

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