Display goes blank after a few seconds.

I have a 3080 with 1 HDMI and 3 DP. The DP my primary monitor has been plugged into continues to work fine, but my secondary display plugged into any other port (HDMI->HDMI or DP->HDMI) goes blank after a few seconds.

Sound still plays if going through the connected display, so the issue is entirely with the video.

I've swapped to an old TV and used different cables and all 3 ports besides the one my primary display is in and the issue remains the same. Both screens I've used work without issue with input from a different source.

OS: Windows 11

So: How and why would the video output from my PC stop with sound continuing and how do I get it to work again?