I start up Forge via the launcher, and it shows me the Mojang loading screen just fine before going to a completely black fullscreen. Clicking around on it reveals that all the buttons somehow still work - I can even properly create a world - but I just can't see anything except a black screen and my mouse. I've tried finding a solution to this elsewhere to no avail.
I have nothing else installed, no mods or anything. It's just Forge.
FML log is here: https://pastebin.com/qqbwUSGA
LMK if you need any other details. Thanks.
Edit: It's fine now. I just can't play on fullscreen, lmao.