Sean McBride:

The problem I discovered was that one of the thin walls between the
holes had broken and bent down, forming a ramp. When I plugged the DVI
adapter into my computer, two of the pins went into the same hole, and
the projector could no longer understand the output from my computer.

However, it doesn’t end there. When I plugged the DVI adapter into
the broken socket, the ramp formed by the broken wall bent the
corresponding pin upwards, forming a wedge with the adjacent pin. Then,
when any other Mac user plugged the same adapter into
their own computer, the pin wedge would press down on that same socket
wall, breaking it and bending it down in the same fashion. (alwaysBETA)