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A pinched wire means that the wire was causght between the grips and the frame. You can flat spot a multistranded copper wire and end up breaking the individual strands in the wire to the point where the impeadence of the wire exceedes its ability to transmit current. If you pinch a wire, you can cut it. Even if the shielding looks intact, you may have an inturruption in the continuity of the wire. Put it on a circuit tester to make sure you have continuity. If you still have continuity and yet have a nonfunctional marker, then it is time to take it to the shop so they can make sure the board isn't fried.
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