I was looking at display settings on AMD Radeon settings, when I accidentally clicked on Enable Clone. Whatever, just disable it, right? No, it seems to have completely messed up my second monitor. It still works, as if I re-enable cloning, it still works, but whenever I disable it, it goes back off. Windows recognizes it... Sort of? Everything's greyed out, and I can't really do much, but Radeon settings doesn't seem to recognize it at all. Nothing seems to work, so it's up to you, random strangers on the internet.