I have a Macbook Pro Medio 2012, 15 Inch Non Retina. It was running on a normal 750G HDD, but i wanted an upgrade, so i bought the Samsung V-Nand 850 EVO SSD 1TB.
I created a Bootable El-Capitan USB Stick, so i could do a clean install. After i swapped the HDD with the Samsung SSD, i plugged in my Bootable USB stick and turned on my macbook.
First it shows the apple logo with a loading line. after that i gives me a "stop sign". A circle with a line running through it.
I also tried pressing the Command button while it starts up, but that didn't work.
I'm trying to clean install El Capitan on my Macbook pro.
Does anyone know what to do?
Kind regards in advance!