I installed TrueNas Core on a HP ProDesk 600 G1. It has 2 DisplayPorts and a VGA. Both DisplayPorts doesn’t work only VGA works. My monitor doesn’t have a DP only HDMI so I used a brand new adapter DP to HDMI. The computer has an integrated GPU.
You could try a Live Linux image to see if that works. You might have to move to TrueNAS Scale.
You didn’t mention the hardware details so we have no clue what integrated graphics you have.
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Once you’ve installed TrueNAS, for what purpose do you need any video out? It’s entirely configured and administered over your network.
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Thank you, I tried a Live Linux Image and it works.