No HDMI output after attempt to switch debian to xorg. Same on new ubuntu image

I was using debian on wayland. But somethings just didn’t work correctly. After inet search, decided to switch to xorg as solution. So at login chose Debian on xorg. After entering password screen went blank, with no response (that I could see to keyboard). Reboot gave blank screen. Decided to try new start with ubuntu image. Screen initially shows line by line startup through wpa… Then screen goes blank.In both cases my monitor indicates “No Signal” from HDMI. How do I reset le potato so there is once again HDMI output? Why did attempt to use xorg stop HDMI output? Is my le potato essentially bricked now?