I have a MacBook Pro 13,3 Mid 2010. It is equipped with the 2,4Ghz DualCore, 4GB RAM, 512GB SSD. I installed MAC OS snow Leopard successful, but if i try to update, it will reboot and stuck in the screen where you see a grey apple. If i try to install MAC OS El Capitan or Yosemite, it stucks in the screen where you can see the grey apple and a process bar. I tried to install MAC OS on the SSD from another MAC, but if i try to boot from the SSD in my MacBook it stucks at the grey Apple. I changed the SSD to an HDD but it still stucks while booting.