no connection from my gpu to hdmi

i dropped my pc yesterday and the screen on my monitor went black so i took my gpu fully out and popped it back in and i found a chunk of plastic in my pc after so idk if that’s got to do with anything but then i had my pc turned on and it connected to the hdmi for a bit then i realised i need to screw the gpu back in and when i moved it slightly it lost connection again and idk how to get it back