ok so this damn furnace is giving me more problems. it is a goodman gmpn-120-5. at the begining of the winter the heat would not kick on and after alot of trouble shooting, and help from you guys i determined it was the board. replaced it and everything was good until a couple of weeks ago when the fan would keep kicking on and off,, it would do this for sometimes a half an hour but eventually kick on. i figured it was te run cap so i replace it on friday and everything was fine until just about 2 hours ago i realized it was getting cold in the house and went to check on the furnace and the blower fan starts, the igniter comes on, gas valve opens and ignites the burners, but the main fan never kicks on so the system shuts down and retries with the same results. the LED on the board never does flash with any error sequence, so what could be the problem this time?