Hard disk drive mac not boot.
I just change power cord because when I try to open my mac but i can not.
it's show just a apple logo then it disappear nothing happen. After that I try to open it again it's nothing show up in this screen so i turn back to shop that i came before. So I change a new hard disk it's work!!. But I want to recover data from old hard disk. Please help what should i do?
Mac Pro, OS X El Capitan (10.11.6)