Is the GPU inserted?
20 minutes ago, Nex6 said:Solved for now. I wanted to test whether Radeon caption would show with card being unplugged from power. And as expected, it did, but MB showed also VGA error. Ok, so motherboard did see the card. I plugged the power back in, turned the PC on... and it works now. So basically unplugging power from the card, turning on-off and plugging power back in. The power was the first thing I checked and it was definitely plugged in alright. That's what concerns me a bit, but ok...
That's very weird, but consistent with phantom power. Turning on components without the power connected is standard practice for clearing out such problems. That's why techs often tell end users to unplug their router or whatever isn't working. But it's not normal on a PC since they have a PSU to presumably clean incoming power. I would check whether you have a ground fault somewhere in the PC, power strip, or wall socket.

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