Why does my gas-furnace not run? (fan-blower won't start)

I could not see any blown fuses or circuit-breakers; power-switch is on; I ignited the pilot-light and turned the temp to 90 in thermostat - but fan-blower did not start at all, even after waiting for 10 min; I measured voltage at fan terminals and it was practically zero (bleed 0.1v)

Later, I connected power directly to fan-blower and it started running; could it be the control-board malfunction?? Or is it thermostat problem