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@raccoon Basics, off the top of my head:
check case motherboard standoffs to make sure only ones there match up exactly with the motherboard, no extras
it looks like you're using onboard video, is it a cpu/mobo combo that will do that? I learned all but the new special amd ryzen will not output video on motherboards that have video connectors
does the mobo firmware support the cpu? most of the new ryzen with gpu chips require a firmware update before they'll work for example
@raccoon If this is a first build, make sure all packaging and protective stuff is removed between the cpu and the heat sink; should only be a little square of gunk that came on the heatsink, or a small dab of thermal paste you put on yourself
try it disconnected from the case, like sitting on the cardboard box the mobo came in. nothing conductive!
leave an offering of food out overnight to entice shoemaker elves to visit and fix it for you
different power supply?