I just finished installing Honeywell RTH2410B thermostat and AC does not turn on either on auto on fan on. I have already tried turning breakers on and off. Need help any ideas?

You need to flesh this a tad more.

Did you just replace the thermostat only?

Is there voltage at the thermostat? Did you check the breaker that supplies the thermostat for voltage?

I'm going to ask that this question be moved to the Heating and Cooling forum rather then general the electrical forum.