While it is possible, it is so far RARE to see such damage. So there it is, while it should be fine there are situations where it could cause damage. Some folk want an absolute answer and here it's not absolute.
Just bought me a new HP pavilion desktop computer with nvidia GeForce grapics.
When I hooked up the machine for the first time I had not inserted the hdmi cable in far enough so it came no picture.
So I plugged it in properly when pc stood on and headed to boot.
Could it be damage if i connect the hdmi from computer to the screen when the desktop computer standing on?
Nice knowing to another time also, if your pc must be turned off for to connect the monitor with hdmi.
Happy for answers i could get