well from what I can see online code 90 is bad/corrupted boot device is not good but some say it's board dead others say it's CPU dead but this is one of the threads I found, if this is true WTF is going on with these dark hero boards that maybe killing CPU's or them self's seems strange.
If you happen to have another CPU laying around drop it in and see what happens. manual says Boot device Selection (BSD) phase is started
Well same BS VGA led on this board as well and tried a 5900x same issue only constant has been the Sabrent Rocket Plus 2 TB drive I'll try a samesung one since SSDs can make a system sht on itself and fail to display anything
well damn that sucks so its the board or the NVME, well time to test that drive but it's looking like the board and there does seem to be a few complaints about the dark hero VIII board having problems.
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