circuit breaker won't reset

i installed a new AC unit which ran fine. while still running, i ran my microwave (on the same outlet) and both units died. i checked the circuit box and saw only one switch that looked like it had been set to the off position. i've tried pushing this switch back into the on position, which it mostly seems to sit in okay, but i'm not convinced it's set all the way (it doesn't give me the 'snap' sound when i push in on and doesn't seem fully committed to the position). my questions are:
1. is there a way to tell if this switch is really in the on position?
2. if it isn't in the on position, and there's nothing else attached to the outlet when i try to reset it, what could be stopping it from turning back on?
i'm not even entirely convinced this is indeed the circuit breaker responsible for my AC outlet, but since everything else seems to be okay, i have to assume so.
tks in advance
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1) If the switch is on anything plugged into that outlet should operate. IF the outlet is far away plug a really loud radio into it so that when it turns on you can hear it.
2) For some switched you need to pull them all the way down first (Once they have cooled) and then all the way back up. What type of box do you have?
3) If the switch is cooked then it may not reset. It will need to be replaced. AND you should move the A/C to it's own breaker anyway.
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IF
good tip

they
think i did try pulling off then on, but i'll try again tonight. not sure what kind of box it is. do you mean brand?

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This is normal for a tripped breaker. Reset it to off then back to on and it should be fine. Note that if you try and use your microwave w/the AC unit on it will probably trip again. You're trying to pull too much current on that circuit w/both devices simultaneously on and the breaker is tripping as it's designed to do.
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