I have no experience or knowledge of formatting hard drives. When I attempt to install macOS High Sierra, I get the "The recovery server could not be contacted." I did research, and I am sure it is the format of the hard drive. I only have the following: Disk Images "OS X Base System" that is Mac OS Extended. I believe it needs to be formatted at APFS. However, that is the hard drive being used, and I can't format it. If I'm correct, how can I format the OS X Base System to format it correctly to install the software? Thanks!