That is true today but wasn't always back then. My Dell T130 (which I still use today) would not output DVI until you connected a VGA input to flip it to DVI.
But initially the VGA output would be working, right?
I’m wondering if DVI is enabled and can’t be switched to VGA or HDMI if an actual connection to a DVI monitor is missing? But for both the MB video and the monstrous graphics card?