My screen on my Lenova laptop went dim..HELP!

[partyprints]

My screen on my Lenova laptop went dim after pressing the F10 key by accident. This happened before and I read a post that said you just press a certain key upon startup and it worked. But nw I don't remember what key that was. Anyone know what key to press upon startup that will fix the problem?

 

[ScreenSurgeons1]

This might be it. Press F12 upon startup.

Here's the link to the thread.

https/forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/IdeaPad-P500-screen-went-dim/td-p/1252029