Hi! When I was mounting my motherboard on the grommets I used 1 different screw to mount the motherboard while 8 were the same, I didn't have anymore. I then pulled out the 24 pin connector and the screw came off. I didn't hear any creaks or anything. It boots up fine and nothing seems to be wrong. Could it be cracked?
More aboutcould motherboard cracked
It was probably just a loose screw. Do you see any sign of visible damage. If not, then your motherboard is fine.