OSX stuck somewhere between Yosemite & El Capitan

So, I tried to upgrade to El Capitan and my iMac has hung up, had to close.  Gets blocked early in the process and crashes, read many posts on this.

Off, I could not boot normally, because it would not see the operating system and try to install El Capitan with the same result of hanging.

Could not start in safe mode - hangs "checking catalog file. Boot into recovery mode to try reinstalling OS x, and it is trying to reinstall El Capitan.  Tried disk utility first aid for Macintosh HD in recovery mode, and it also hangs "checking catalog hierarchy.

I tried several times normal boots until he actually started - system shows it running Yosemite.  The system is slow and problems.  Ran check and repair, disk fixed disk permissions.

I want to get the system works better, then I'll just try to simply re - install Yosemite at this stage.  Remember, I can't make recovery because recovery think I El Capitan.

I made a bootable USB stick installation Yosemite.  It is, if I re - install the USB, it will completely overwrite everything on Macintosh HD?  Or my files it will be ok and he'll crush only the filesystem osx?  I know you can do a non-destructive reinstall of Mac OS x to recovery, but I don't see an answer for the relocation of a key USB bootable.

Need to know if I can take action if necessary - one of the components does not not since my upgrade attempt is Time Machine.

DRM for all help and advice

If you have a TM backup, you can restore the disc supplied with your computer via a clean install, then restore the system with TM, update the operating system by using the suggested method for apples

Create an installer for OS X - Apple support bootable

Tags: Mac OS & System Software

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