install error upgrade

I updated to Mojave and it showed no signal on my monitors, so i booted into the restore partiton and it says "An internal error occurred while preflighting your volume for APFS conversion." anyone know how to fix this?

I've been trying to update from Sierra to High Sierra for a while with little success. Initially I tried following the upgrade guide, which would get to the point of rebooting to complete the installation and the system would crash. Next I tried doing a fresh installation using an external USB...

trying to upgrade to High Sierra and can’t make it to the installed no matter what I try. I have removed all hard drives except High Sierra USB installer and a SSD that I have formatted previously in Sierra. I’m thinking it’s something in Clover maybe? Have booted in -v -s no luck...

Looking for some help with this error please. I get the appleusbuhcipci error when trying to boot into update from yosemite to el capital using clover guide https://www.tonymacx86.com/threads/direct-update-to-os-x-el-capitan-using-clover.172107/ I get the message after step 6. "When Clover...

Hello everyone, I'm trying to update from El Capitan to Sierra, but it gives me an error like this in the middle of the update: Feb 18 14:49:15 MacBook-Pro Unknown[481]: 2017-02-18 14:49:15.916 macOS Installer[506:19274] *** Terminating app due to uncaught exception 'NSRangeException', reason...

Hello. I am troubled very much not to be able to install Mountain Lion. It allowed I used UniBeast(ver.1.5) and to install it from USB Pendrive so that Tony's guided. But, When it starts from USB, I push the F12 key, and the following errors are given even if I choose a USB-HDD, and...