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On some systems when booted via UEFI you may end up in a console resolution that isn't supported, resulting in a corrupt display. To work-around this issue you can do the following:
At the boot-loader menu, drop to the Command-Prompt (Under Advanced). Run the command 'gop set 0', replacing 0 with 1/2/3/4 until you find a resolution that seems to work with your system.
Once you've come up with a working resolution you can hard-code it by putting the 'gop set ' command in /boot/loader.rc.local.