No Video via HDMI or screen share from MacMini

Hello,
I've had the following setup for over a year now without any problems:
MacMini <HDMI> Denon X2000 AVR
Sony Blue-ray <HDMI> Denon X2000 AVR <HDMI> Sony 55" TV
Cable Box <HDMI> Denon X2000 AVR
Since I don't have a keyboard or mouse for my mini I've setup "Screen Sharing" so I can login from my MacBook and control it as needed.
Everything was fine until a few days ago, I switched inputs from my Cable box over to the Mini and there was no video. I tried "login in" to my mini via my MacBook and I can't see the desktop, it's just a black box. I can however see the 3TB USB 3.0 drive that i have attached to my mini and have access to all my files.
So to recap my Mini starts up, power light comes on, makes the startup sound but I get no video on my TV or in "Screen Share" from my MacBook. I do however have access to my files on my Mini via my MacBook.
Has anyone had this situation before? I've checked all the HDMI cables by taking the one from my Cable box that is working and plugging it into the Mini to no avail. I've also restarted the mini multiple times.

I've got a 2011 Mac mini.
Since I don't have a keyboard or mouse for my mini I've setup "Screen Sharing" so I can login from my MacBook and control it as needed.
Same here! I've been using Screen Sharing to use this mac mini since I purchased it in 2011. I've never had a monitor hooked up to it.
Everything was fine until a few days ago, I switched inputs from my Cable box over to the Mini and there was no video. I tried "login in" to my mini via my MacBook and I can't see the desktop, it's just a black box. I can however see the 3TB USB 3.0 drive that i have attached to my mini and have access to all my files.
A few days ago I connected my 41" Samsung TV to the mac mini using an HDMI cable. Since doing so, I can still connect to the mac mini and browse the mac mini's file system in Finder (Desktop, Applications, Documents, Movies, Music, etc...) but when I click Share Screen... with that mac mini via the Finder (as I've successfully done for years) it just hangs, and eventually I get the message "Connection failed to mac mini... Please make sure that Screen Sharing (in the Sharing section of System Preferences) is enabled on the computer to which you are attempting to connect. Also make sure your network connection is working properly."
So to recap, the only thing at all that's changed on that mac mini was plugging in the HDMI cable to the television. And now I cannot use Share Screen with it.
For what it's worth, I did hard reboot the mac mini and was able to successfully Share Screen. But after going away for most of the day and coming back, now that I try to Share Screen I again get the error message I pasted above.
Any help would be really appreciated. I don't want to have to reboot my mac mini just to Share Screen for a couple hours every time I want to use it.
Edited to add: while I can't Share Screen to that mac mini any more since plugging it in to the tv with the HDMI cable, for what it's worth I can still control iTunes using the Remote app for iOS. I doubt that's too relevant but adding it here just in case.

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No Video via HDMI or screen share from MacMini

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