During a meeting earlier this week, an extension cable came unplugged and got plugged back in. The cable was used to hook a laptop on a lectern into an InFocus machine. The two cables came from different manufacturers, and the shells were different, which allowed the cables to be plugged in backwards, despite both shells being trapezoidal in shape. This mistake resulted in one of the male pins being impacted back into the housing. When I discovered the problem, I was able to use some pliers to pull the pin back out, and tested the continuity of all fifteen pins in the cable. All pins were fine, and the pin that had been impacted had not been shorted to the shell. However, the projector no longer receives a signal from that line. Replacing the cable is the simplest solution (actually, the ONLY simple solution in this case), but I can't find anything wrong with the cable, so it seems unlikely to do anything. However, it also doesn't look like any of the other pins would have caused a problem in this case, as none of them were carrying power, just signal, based on the pinout configurations I have found online.

Can anybody suggest where to look next, and why? There doesn't seem to have been enough current available to have caused any components to short out if pins had been connected incorrectly, but the result is that the system doesn't work anymore.