INSTRUCTOR PLT LANDED WITH THE NOSE GEAR UP AFTER TRYING UNSUCCESSFULLY TO EXTEND IT; EVEN MANUALLY.

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ON JUN/XA/97 AT APPROX XA30 I WAS INSTRUCTING A STUDENT ON AN AZTEC PA23-250. WHILE WE WERE DOING A SLOW FLT MANEUVER; I NOTICED I DID NOT HAVE A 3 GREEN LIGHTS FOR THE LNDG GEAR. I TRIED TO RECYCLE A COUPLE OF TIMES WITHOUT SUCCESS. AT THIS TIME; I MADE THE DECISION TO RETURN TO SRQ ARPT. ENRTE; I ATTEMPTED TO PERFORM THE FOLLOWING PROCS: CHKING ALL CIRCUIT BREAKERS; APPLYING G FORCES; MANUAL HYD PUMP; USE OF CO2. NONE OF THESE PROCS PRODUCED RESULTS. I CONTACTED THE TWR AND FLEW CLOSE ENOUGH FOR THE CTLR TO CONFIRM THAT THE NOSE GEAR REMAINED RETRACTED. THE CTLR SUGGESTED I TOUCH DOWN AND BOUNCE OFF THE GND TO ATTEMPT TO DISLODGE THE NOSE GEAR; IF I FELT COMFORTABLE WITH THIS. I FELT IT WAS TOO DANGEROUS AND DECIDED AGAINST IT. I ATTEMPTED ALL EMER PROCS A SECOND TIME AND WITH NO SUCCESS; I DECIDED TO MAKE AN EMER LNDG. ONCE ON FINAL; I DETERMINED THAT I COULD MAKE THE RWY SAFELY; I CUT BOTH ENGS; PROPERLY POSITIONED THE PROPS AND GLIDED THE AIRPLANE. I LANDED ON THE MAIN GEAR; ATTEMPTING TO KEEP THE NOSE UP AS LONG AS POSSIBLE. AFTER SPD WAS REDUCED THE NOSE HIT GND AND DRAGGED APPROX 300 FT. AFTER COMING TO STOP; I CHKED WITH MY STUDENT TO MAKE SURE HE WAS UNINJURED AND WE EXITED THE PLANE AS QUICKLY AS POSSIBLE.