Although the HDMI dummy plug is a fairly generic device that's quite easy to make at home, if you're good with the soldering iron. Before we get into all that, you might wonder why I'd want to use my PC in a headless setup, lacking a display. There are at least two use cases I can think of immediately. First, when I remote into a PC using a low-powered laptop, I don't need this PC to have any I/O accessible on location so long as it is powered on. However, when the GPU cannot detect a connected display or monitor, the remote client defaults to a rather low default resolution of 1024x768 pixels