There is a PC desktop, have a macbook, now they are both connected to the same Dell monitor two DVI inputs and I sometimes switch from one system to another. You can make tacos the same with monitors from Apple?
When using a direct connection "Macbook → Thunderbolt Cable—HDMI → TV" — the image is displayed.
When connecting "Macbook → Thunderbolt Display → Thunderbolt Cable—HDMI → TV" — the image is only on the Thunderbolt Display and the TV hangs — no signal...
Here is the cable: