Maybe you're right, but I haven't seen a GPU that doesn't have at least 4 distinct outputs in a while, not that I'd expect one in a machine of this class either. The problem, if I were to guess, is that this machine has AMD iGPU with Nvidia dGPU and a switchable MUX on top of that so it could boot with(or without) either as primary. That's like three points of failure already. On top of that, I had the main panel cracked and badly malfunctioning, so I've removed it, just in case, for about a month while I waited for replacement. I guess some firmware update did not expect the main panel to be missing(or to have different s/n) during update and did something stupid to the mux setting that made it so that two outputs can't be active simultaneously. I've tried to reach someone half-competent at ASUS for like a couple months, then just said "fuck it" and installed linux. Now living happily with 6 displays up and running, theoretically up to 9 if I do some output splitting shenanigans. Someday I'll actually build that setup just to dunk on that rep who told me it could only handle 3.