Yesterday the SSD in my 13" mid-2012 MacBook Pro died. I replaced the old one with a new one.
First I tried to reinstall macOS with my Time Machine backup, but it failed. Then I tried to install a fresh copy from Internet Recovery Mode, that failed too. My last resort was to make a bootable USB on another Mac and install it that way. At first it seemed to work, but when it boots the drive does not show up as bootable.
I tried running Apple Hardware Check, but could not access it. It just showed a folder with a question mark.
Is there anything left to do?