Boiler will not fire model is slantfin s60 DP?

new thermal couple...last week i had noticed the damper (automatic) was in the closed position. i nudged it a bit and it opened and the boiler fired...needed to fix a radiator pipe and shut it down...now it won't fire. mounted on the boiler is..pilot unit (works) a control box when i turned on the circulating pump a grey switch inside moved. that no longer is the case...near that a small box with a red on (like a reset on) pushed it nothing happens...wires from the control box to round black unit that controls the damper automatically. i manually opened the damper....3 other boxes mounted to pipes controlled by thermostats...there is power to these..any help before i call in a professional would be appreciated