I am a student who is one of the members of our esports society committee, I've been given one of 5 computers to try and fix, all with the same problem after transport, green dots on the display, as shown in photos. It is definitely graphics card related (swapped to another computer), tried different monitors and ports, updated bios. If anyone knows any other cheap/free ways to fix it (we don't have much money in the club), it would really be appreciated. The only thing we can think to do is bake the cards, but that could destroy them, so it is the last resort.
Thanks for the help!