Q: This update ( Security Update 2016-001 El Capitan and Security Update 2016-005 Yosemite)  broke my iMac. I had to  restore from Time Machine 2 times!!!!!!!

My iMac after this update boot with grey screen in safe mode too, very bad update.

also happened to me on my MacBook Pro retina mid-2014 model. There must be something wrong with the update software! Frustrating when you are trying to do the right thing and keep up with the security updates!!!

Neither of my Macs are suffering from any problems from this update.

Please download and install EtreCheck from http://etrecheck.com/

Run it and post the report here.

With grey screen i can not install or run anythink

i think the only solution will be to format with a new

installation

Startup – Computer Stops or Delays

Startup Issues - Resolve

Startup Issues - Resolve (2)

Startup Issues - Resolve (3)

If you get the computer started, try installing these 2 downloads.

Security Update 2016-001

Security Update 2016-005      Yosemite

Update: I was able to get the security update 2016-001 installed. It appears to be fussy about some software you may have installed. I uninstalled the DuetDisplay software for using an iPad as a second monitor as it had loaded a kernel extension. I also uninstalled Evernote after the EtreCheck diagnostic app showed that the Evernote helper was crashing on load. I hope this helps someone else as I wasted hours today troubleshooting this.