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Most likely a failed cable. They usually break right at the VGA connector.
If you have access to a multimeter, you can check continuity on the red signal wires (usually one of 3 coaxial cables within the larger cable). If you can solder, you could cut the 15 pin VGA plug off, and replace it without too much work.
Otherwise, you need to signal trace the red signal from the input connector pins to the CRT. The signal path is pretty straightforward, and you have the Blue and Green channels to compare voltages and waveforms against....
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