If you crack open the dryer there is a schematic wrapped up about the size of a cigarette.. In it is the full schematic for the dryer.. with this you can troubleshoot all of the safety switches.. Once they check good then you can move on to replacing the computer module if it still doesn't work .. From what I have seen a lot of the problems are caused from the broken belt switch tripping. On mine if you slam the door it will trip and cause the dryer not to run..