Trying to help someone attach their computer to a TV. I mean, I can get it work, no problem. The problem is that even with the TV off, the computer still treats it as a 3rd monitor and you can lose your mouse in the abyss to the right side of the screen.
And whenever they want to use it, they have to go through the hassle of making it the primary monitor, and then when they're done, make the computer screen the primary again.