Member Since: Oct 01, 2007
Mac Specs: 27" iMac i7 (2011) 10.9, iPhone5s, iPad Air, AppleTV2
01-27-2012, 08:30 AM
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
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