How can I switch my resolution back after getting a black screen?

Hi!
A couple weeks ago I connected my iMac (2012) to my LG TV. Everthing was working fine until my screen on my iMac blacked out. Even when I disconnect my TV from my iMac, my screen remains black. There's no sign of a dimmed backlight or a broken backlight. After I wake my iMac up from sleep it shows my log in screen for half a second and then it pops back to a black screen.
I think I switched to a resolution my iMac couldn't handle, so it blacked out, I just don't know how to get my screen to work again. PRAM reset doesn't work.
I also tried to share the screen with my MacBook while being disconnected from my TV so I could change the resolution that way, but that also won't seem to work. I'm stuck right now and I don't know what to do. I hope someone will be able to help.

That was the first thing I tried, it used to switch back to only my iMac screen but it didn't work.

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