HI, I recently extended a room into my garage I added 10 ft. of base board and now when I turn on my boiler neither the upstairs or downstairs lines get hot, I tried letting the boiler run with the drain valves above the 2 circulators open to let air out and nothing comes out...

Is the fill valve open?
Did you bleed the air at the fartherest and highest point in the system?
Is the expansion tank empty?
Is the pressure set correctly on the auto fill valve if installed?
Are the zones calling for heat?
Do the circulators run if activated?