Hello! I just installed a Seagate 1TB Firecuda SSHD in my 2010 iMac. All was going well, but when I went to boot it up by pressing Control R,or Option, I kept getting the grey folder ? Icon.
Responses on here say the hardsrive needs to be formatted but like I said, even after holding these keys nothing works. I also made a bootable external drive and tried to run off of that.... was essentially installing an operating system from the external to the Firecuda. But it did not recognize it....