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OSX Security Update 2015-003 1.0 Thanks a lot for the link!! The solution works for me. My NVIDIA web driver version is : 343.02.02f03.

GTX-970 is no longer detected after the 2015-003 update. To fix this issue, please check out this link: http://www.tonymacx86.com/graphics/159885-security-update-2015-003-breaks-nvidia-web-driver-again.html It works for me.

Update from the app store without any problems with my Nvidia GT 640 2GB card. As usual, I had to re-apply the TRIM Patch and reinstall audio driver using MultiBeast.:headbang:

Try this post: http://www.tonymacx86.com/yosemite-desktop-support/144644-prohibitory-sign-when-booting-install-usb.html

I just realized this is also happening to me. Anyone knows how to fix this yet?

By motherboard boot option I mean "boot option" during start up. Sorry for the confusion. you are using gigabyte board same as me, so just hit f12 during boot up.

I'm tying to remember what i did exactly since i did the upgrade a couple of days a go and I ran into so many problems. I believe I always boot using the motherboard boot option to avoid that "mach_kernel" error. After the upgrade was successful I still have to boot from the usb one more time...

try to boot with -x -v -f option. it works for me.

I got the same issue. Boot with option -x -v -f worked for me.