To make an old Samsung monitor work with my Raspberry Pi (Pi 3 Model B+) I had to set the hdmi_boost option in the /boot/config.txt to 7 (without that it shows green vertical lines, or green snow, depending on the HDMI-cable I use)
After a while I connected my Pi to my other monitor (Eizo) (with a HDMI to DVI connector) - which worked fine for the Pi before. I forgot to remove the hdmi_boost=7 settings. This lead to the following situation: The monitor remained black and only showed an Error Message: "dotClock: 0 out of range" . Ever since my Pi can only use the lowest resolution with my Eizo monitor (works well with the Samsung), to achive this I set the hdmi_safe option to 1 in the /boot/config.txt file. When I connect the Eizo monitor to an old computer graphics card via the VGA connector it works perfectly well.
Thus I wonder: Is it possible to damage the DVI electronics by setting the hdmi_boost option to a high value such as 7.
Kind regards Stefan