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<< Solved >> Screen now only black - seems like no signal - without updates

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May 1, 2017
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Motherboard
GA-Z270MX Gaming 5
CPU
i7-7700K
Graphics
RX-580
Mac
  1. iMac
  2. MacBook
Mobile Phone
  1. iOS
Originally I started with a Gigabyte Geforce GTX 950 card but owing to the lack of support in later MacOS versions I upgraded to a Gigabyte Aorus RX 580 card and removed the nVidia drivers and made sure my kexts were up-to-date. All went well. However, after leaving my PC on overnight (as I always do) on 26th May 2020 the next time I tried to use it there was nothing coming through on the display. The monitor was showing "no signal" and sleeping.
I have restarted/power toggled the machine multiple times but all I get is the boot sequence with the progress bar getting almost to the end before a brief white screen (like a flash) and then no signal.
I am able to dual boot into Linux from a separate SSD in the machine so I can see there are no hardware issues. Given I have not installed anything on it I am at a loss as to why I can no longer get a full boot and signal to the monitor.
 
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