No entry sign stops boot after updating Yosemite - help please?

[whitedragon101]

I have just updated yosemite and I get a no entry sign on boot and thats it, it won't start up. I do have a third party hard drive and trim enabled so I tried this.

http://www.cindori.org/trim-enabler-and-yosemite/

But it still won't boot.

(When i performed the last command
kextcache -u "/Volumes/Your Disk name"
it went to the next line immediately, no delay, not sure if it ran properly)

If anyone has any ideas that would be great.


ps

If I just do a reinstall OS X from the CMD+R recovery will it keep all my installed apps from OSX and leave my windows bootcamp alone?

 

[KALLT]

I have just updated yosemite and I get a no entry sign on boot and thats it, it won't start up. I do have a third party hard drive and trim enabled so I tried this.

http://www.cindori.org/trim-enabler-and-yosemite/

But it still won't boot.

(When i performed the last command
kextcache -u "/Volumes/Your Disk name"
it went to the next line immediately, no delay, not sure if it ran properly)

If anyone has any ideas that would be great.

Have you tried again? Did the previous steps not work?
Perhaps you could contact the developer if nothing else works: https://forums.macrumors.com/members/153120/

If I just do a reinstall OS X from the CMD+R recovery will it keep all my installed apps from OSX and leave my windows bootcamp alone?

It should. Do you have a (Time Machine) backup ready, just in case?

 

[whitedragon101]

Have you tried again? Did the previous steps not work?
Perhaps you could contact the developer if nothing else works: https://forums.macrumors.com/members/153120/



It should. Do you have a (Time Machine) backup ready, just in case?

No errors occur when typing in the commands. The only thing thats a little suspicious is there is no 5-10 min wait after the last command. But no error either.

I do have a time machine backup.

 

[KALLT]

No errors occur when typing in the commands. The only thing thats a little suspicious is there is no 5-10 min wait after the last command. But no error either.

I do have a time machine backup.

I’m not sure whether a reinstall will fix the issue, so I can’t give any advice. Normally a reinstall should leave the personal files untouched and only reinstall/repair the system files. I suspect that the kext files (system files) will be restored as well. It’s up to you whether you want to give it a try or not, if the solution on that website doesn’t work.

 

[whitedragon101]

I restored from a time machine backup and things seem to be working although quite a few apps are missing. But only some apps.