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This can be from several things. IF the motor won't come on, then it may be the brushes are bad and the motor needs replacing or it can be that the time delay relay is bad and isn't kicking the motor on. It might also be a loose connection. This should have an outside inspection cover over the furnace and so this isn't a hard one to check if you have a small digital multimeter or 12 vDC test light. Not expensive and easy to use and I can direct you in some quick testing to sort this out. Just let me know. All follow ups are included in our fee.
Not sure if you missed my earlier response the other day? If you still need assistance and more input from me here, please let me know. Thanks!