Most likely that won’t help, but on the Pi4, did you use the correct HDMI output? It has two and you’ll have to use the one closest to the power connector. See Pi4 Device doesn't start (it’s the left one in the picture).
Did you get any signal at all from the Pi? What are the LEDs on the Pi doing? There are two of them. Is the red or green one on at all? Are they blinking in a pattern after you connect power?
What you can also try: Put the SD card back into another computer and create the file /config/userconfig.txt on the SD card. Add the following content:
hdmi_group=2
hdmi_mode=81
Then put the card back into the Pi and connect power again. This will explicitly set the mode 1366x768. Maybe that help?