How can I install mac os on my new SSD drive?
My mac is getting old and slow, so I thought I'd give it an update. I bought 2x4GB Corsair macmemory and a Samsung evo 850 SSD. I formatted the drive and downloaded OS X El Capitan (since it is what I have running on my old HDD). Then I installed the OS on the SSD through the USB port using a Sata-USB, and it booted like a charm.
Next I switched the SSD for my internal HDD and tried to boot, that's when I came into trouble. A message saying "unapproved caller. Security Agent may only be invoked by Apple software". Then I connected the old HDD trough the data cable and booted, no problem.
Why is my SSD only working when attached to the USB and not when it is internal? I read somewhere to check the firmware, but I couldn't quite figure it out. I currently have SMC-version: 1.68f99 and Start-ROM-versjon: MBP81.0047.B2C.
Thank you very much for help.