Question: iMac 2017 can't reinstall High Sierra
I need some help. A friend bought second hand an iMac 2017 27" with fusion drive. The guy who had it said he formatted the disk before giving it to him. When my friend open the computer it started on the install screen. He selected to reinstall the OS but it said that it couldn't. He tried to format the disk, it showed a "Fusion Drive" as a device and another disk as a volume. The device has greyed out the erase button. The volume can be erased. When I went there, I brought a usb with 10.13.2 that I made a while ago for my computer and I knew it was good, it worked. I put the usb on, restart with "option" key, boot from my usb and format the disk as APFS. Now there is no separated device and volume, there is just one disk. I start the installation, but when it reaches the drive to install, the disk is greyed out, showing a message that the OS can't be installed, and I should get more info on this site: APFS Fusion. I go back and the disk won't format to anything but APFS. So I click on partition, create a volume, format it as HFS+ and go back to installing. This time the disk was available, I selected it and the installation started. However after 2-3 minutes a window popped up, saying there was an error and I should try later...
I'm very confused, I never had an issue like that. As a final solution, I formatted again the drive as APFS, then restarted the computer pressing option + command + R to start Internet recovery. It started fine but after like an hour the same message appeared again.
Does anyone have any idea what I should do?