Troubleshooting of an installation fails to El Capitan on macbook pro

I installed a Samsung ssd 6 months ago. It was working fine with snow leopard, when I upgraded to 10.11.2 installation never finished instead went into a reboot loop. I am able to get into safe mode and recovery mode.

-Try to reset memory NVRAM/PRAM and SMC

MacIntel: Reset of the controller (SMC) system management

Subject of memory NVRAM and PRAM

-Try to start safe mode

OS x: what is Safe Boot, Safe Mode?

-Start to recovery and repair the startup disk

OS X: on OS X Recovery - Apple Support

-If it is repairable reinstall the OSX

How to reinstall OS X on your Mac - Apple Support

-If you do not have a backup using disk utility to restore the internal drive to an external drive, so that you can try to recover the data.

Format the boot disk and then do a fresh install of Mac OS x

Tags: Notebooks

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