I don't now what to recommend except to try another monitor, or repair your laptop screen. Sometimes it only needs the cables reseated. You should be able to google a video for your model (or close) to see how to replace the screen, which will reveal where the cables are which might need replugging. If not then you can replace it with a new screen you order by googling the make/model for a replacement screen.
Even if you could access F8 and navigate to Last Known Good, I dont' think it would revert. But you can try it:
If you can get into Repair console and then somehow navgate to System Restore (or even Startup Repair which automates it) that might be worth a try if you can find your way through these screens starting with Option One in System Recovery Options