I just bought a Chromecast with Google TV and plugged it to an LG 27UL600 monitor. First boot up, it turned on just fine and I successfully set it up and even watched some Moon Knight for a test run. Then I switched over to HDMI port 2 to play on Xbox. One hour later, I switched back to port 1 and it's all black screen.
I thought it was just unresponsive to the remote. The monitor doesn't seem to be compatible with it, so I tried maybe turning it on via Google Home app, but it said that my Chromecast is still on. Even the light is white. I tried pressing random buttons and through the app it shows some activity. So clearly the Chromecast still works.
Tried a different HDMI port and still nothing. Both ports still works because I tested with my Xbox and both displays it fine. Tried rebooting both the Chromecast and the monitor, still nothing.
Why is it behaving like this? Any explanations?