for people who booted up fine the first time around, decided to give more cores or ram and went back to find the apple logo upper left and weird graphical anomalies try restoring the <os> section of the xml with what was originally there when you first installed.  You're welcome.   <os> <type arch='x86_64' machine='pc-q35-3.1'>hvm</type> <loader readonly='yes' type='pflash'>/mnt/user/domains/MacinaboxCatalina/ovmf/OVMF_CODE.fd</loader> <
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