Same problem, did buy four 3080 MFF for my customer along with HDMI-BenQ as Dell Screens were not available now. Two screens, DP-HDMI cable and HDMI-HDMI cable...SO unstable, latest bios, latest drivers Win10P. Did power cycle the Dell, that helped, but the other day NO picture but the computer is on and booting. Update= the issue have been resolved, I did change the hdmi-cable to a 4k-version, though the displays are fine. Works fine now.
Have two monitors with HDMI only, so I bought DP-to-HDMI cabel and now experiencing issue when Windows 11 is starting. Scenario: - Both HDMI and DP are connected - image is showing only on one monitor (usually it's DP) - If I unplug any cabel (depending on the result of #1) second screen won't show an image. - Only HDMI is connected at boot and later DP is plugged in - image is showing on both monitors - Only DP is connected at boot and later HDMI is plugged in - image is showing on both monitors Looks like a problem with hardware, DP is selected as primary output and HDMI is not working. Or it's a problem with DP-to-HDMI cabel?
Dual monitor issue with OptiPlex 3080 micro