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If the flue blower (the one blowing out the roof vent) does not come one and stay one, the main blower won't turn on. It's a safety detent.
You might want to clean contacts and check things over to be sure everything is in place and there are no obvious signs of loose connectors, etc.
Get down there and test with a multimeter. Every furnace has a wiring diagram on it. If it's beyond your ability, get a guy to come in and test things out. It might only cost you the cost of a house call, but then you'd know for sure what's broken.
If you are not freezing your butt off in texas, you might be able to track down the part and replace it yourself.
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