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mrplow

 
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Member Since: Oct 01, 2007
Location: UK
Posts: 6,748
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Mac Specs: 27" iMac i7 (2011) 10.10, iPhone6, iPad Air, AppleTV2

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It could be that the OSX install is corrupt but . . first things first.

Try resetting the SMC
Intel-based Macs: Resetting the System Management Controller (SMC)

and the PRAM
http://support.apple.com/kb/HT1379

In Safe-mode have you used Disk Utility to repair your permissions and verify the disk ?

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