Discovering that a single room in your house has absolute zero airflow from its supply registers points to an isolated branch restriction or a disconnected duct run. First, remove the room's register grille and check inside the boot for physical blockages, closed dampers, or fallen debris. Second, trace the accessible branch ducting in your basement, crawlspace, or attic to verify that the flexible duct has not completely sheared off its metal takeoff collar or become severely kinked and crushed. Third, ensure that interior doors left closed are not creating a pressure differential that prevents conditioned air from entering or returning. You can troubleshoot by inspecting duct connections thoroughly. You can verify that your corrective action was successful when reattaching a severed duct run or opening a closed damper restores strong, forceful airflow to that specific room.
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