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mrplow

 
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Member Since: Oct 01, 2007
Location: UK
Posts: 6,695
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Mac Specs: 27" iMac i7 (2011) 10.9, iPhone5s, iPad Air, AppleTV2

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Have you tried setting mac os x as the default startup in system preferences?

If that doesn't work please go to terminal and enter:
diskutil list <enter>

Post the results back here.

External hard disk acquisition addict - but admitting the problem is the first step to a robust backup

Please use the reputation system if you think you've been helped - top right of this post
QUOTE Thanks