How is this Linux computer able to output video without a display connection?

I bought a Tempo Studio a little over a year ago and love the weights but not the subscription software. I'd seen it fail into GRUB before and know it's Ubuntu-based PC and figured, how hard could it be to display my iPhone on it? I decided to crack it open. All the cables, sans the thick one with the many different-colored strands at the bottom, are labeled, and none of them are video except one. The one HDMI cable runs from the video card into the motherboard. Unplugging the videocard motherboard connection and into a display showed the interface, which what I would expect. I plugged in my l

Question by Ian Hyzy on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.