Xbox 360 E - No Video/Audio, No Controller Connection

I have a Xbox 360 E console that has been working fine since I bought in in 2020. I went to turn it on for the first time in a while and it powers on with a green LED (this model only has a single light, not multiple like older models). The power brick light comes on as well, and everything seems fine. But no video is outputted to the screen, nor can any controller connect to it (the indicators will just keep blinking).

It’s baffling to me, since I take very good care of my consoles and this was working one day, now it isn’t. The disc drive still opens and closes whenever I press the button, everything seems to be working except the video/audio output (this console only supports HDMI), and the controllers.

I opened the system and deep cleaned it again just to be sure, but that didn’t change anything. But since I cannot connect any controllers, I cannot reset the display settings to see if that is an issue. My troubleshooting options are quite limited.

Any ideas would be appreciated.