My guesses here would be dirty air filter, open (blown) fuse on your control board, or maybe your blower motor. What brand of furnace do you have, as that could help with troubleshooting.
In any case, first thing I'd try is changing or just removing for now your furnace filter and then shut power off for a couple minutes again to reset it. Then give it a try. Next, is your blower motor working? If it's out, the burner will trip the high limit switch. Also, check any and all fuses that you see on the control panel inside the furnace and make sure they're not blown.



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