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Sur3Mac

 
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Member Since: Aug 03, 2009
Location: The Netherlands
Posts: 1,563
Sur3Mac is a jewel in the roughSur3Mac is a jewel in the roughSur3Mac is a jewel in the rough
Mac Specs: Late 2011 MBP 13" i5/16GB RAM,Early 2007 MB white 13", 2x TV 3rd Gen, ᣦ

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Open Disk Utility & select the hard drive from the list (not the name of the volume indented under it).
At the bottom of the window, you will see a line of info that tells you the Partition Map Scheme of the drive. It should be "GUID Partition Table."
Is it?

In Disk Utility select the volume & click the Verify Disk button.
If it reports any problems, follow the instructions at the top of the window to restart from your installer disc & run the Repair Disk step.

Also post your specs plz like tattooedmac asked, it will make it easier for us to give a proper response.

Also, I'd advize you that if this does not work, check what the update is doing for your system, like in big important
changes.
If it doesn't have them, consider skipping this one and hold out for the next one.
A lot of people are experiencing issues after this update

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