A tiny piece fell off from the logic board, black screen forever

Hi everybody . I replaced GPU thermal paste today and accidentally broke one GPU standoff on the logic board when I was tightening the screws.

And a tiny piece fell off from the logic board.

I actually tested my MacBook before I tightened the screws and it worked fine. But now just black screen when I turn it on, though I can hear the startup chime. What’s the name of that tiny piece? How to put it back (or do I need to)? Also is that possible that the broken piece and standoff cause black screen?

Thanks in advance!