Booting up after El Capitan upgrade.. computer hangs at 70% on the progress bar
Macbook Pro 13 inch Late 2011.
El Captian installed fine. (but ran super slow)
After the last upgrade. just restarted the machine.
Upon restart the machine hangs at 70% progress bar on bootup.
Any ideas.
MacBook Pro with Retina display, OS X El Capitan (10.11.4)