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I have been having this problem for a while, I replaced the monitor and had the same issue. I even replaced the video card with the same issue. I have replaced the HDMI cable twice and it still happens. What happens after waking from sleep the monitor loses signal from the card every minute...

My system worked fine up until updating to 10.14.4. I have my UHD 630 set to run headless and I use my Saphire RX 580 as my primary. It now after going through the verbose output of boot goes to a black screen upon where it usually shows the apple logo. Any idea why this is happening? I...