Inside AC unit fan does not turn on (outside unit working)

Ah, the summer in Texas. When the cooling system kicks on, my outside unit spins up, but the inside unit fan does not turn on (one clicking noise can be heard). Same happens when I put it on "fan" mode.
The thermostat (I have a Nest) seems to be good. Replaced the air filter. Toggled the circuit breaker and the unit-specific switch. The capacitor seems ok. Now I'm trying to investigate the electricity flow to the circuit board. Can someone advise on how to test this? What should I be seeing at this switch?


When I test voltage between R and C on the circuit board, I'm not getting anything. Should I be seeing constant 24v or only when the fan is on?
Rest of the setup for reference:

 

Looks like the transformer below the control board powers the board. Make sure the door safety switch is depressed when testing from R to C.

 

You don't have a transformer problem since your condensor is firing up.
Like mentioned.... the blower safety switch needs to be held in for any testing.

You need to check the 120vac going to the blower motor.
The blower wiring is the larger wiring at the top of the board. Look for N (neutral) and COOL H. The system needs to be calling for cool to get power here.

 

Thanks guys for the advice. Turned out to be a bad circuit board. Replaced and back in action!