From the NCAA rule book:
Art. 3.
In games when an official uses instant replay to review a potential shot-clock violation as in Rule 11-2-1-b
4, the official shall determine whether a violation occurred by the sounding of the shot clock horn. If the shot clock horn is not audible, the official shall use the reading of zeroes on the shot clock to determine if a shot clock violation occurred. When definitive information is unattainable with the use of the monitor, the original call stands.
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It would seem that the horn is the first determinate. However, by implication, if the shot clock shows a definitive reading of zeros then the shot clock can be used.
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