This might very well be a fuse - check by setting the sub woofer to "On" to see if it powers up. If it does, there may be a problem with the sub woofer audio cable(s) or connection(s).
Don't forget to check for a tripped circuit breaker or blown fuse on the stereo's speaker output. If your sub is connected to a low level output - this shouldn't be a possible cause - as circuit breakers & fuses are usually on amplified (high level) or speaker outputs.
Another possibility is that the settings of the stereo has been changed from a *.1 system to plain stereo 2.0 or some other setting that disables the LFE (low frequency effects) or sub woofer audio output.
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