B737 CREW ABORTED TKOF AFTER RECEIVING THE TKOF WARNING HORN DUE TO FLAP CONFIGN.

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THE ACFT WE HAD FOR THIS FLT HAD 2 MEL'S: AN INOP FUEL GAUGE; AND AN INOP APU. AT THE TIME WE PUSHED FROM THE GATE (APPROX XA00) DFW WAS IN THE MIDST OF A DEP RUSH. SINCE WE HAD TO DO A XBLEED START; WE DID NOT DO THE AFTER START CHK IMMEDIATELY UPON TAXIING (PER COMPANY POLICY) SINCE WE STILL HAD AN ENG TO START. WE GOT CLRNC TO TAXI AND REQUESTED A SPOT TO DO THE XBLEED START. WE STOPPED ON THE PARALLEL TXWY G; ADJACENT TO THE TERMINAL; AS INSTRUCTED AND COMPLETED THE START. AS WE WERE FINISHING; GND CTL WAS GIVING INSTRUCTIONS TO ACFT TAXIING TO RWY 18L MENTIONING US IN REF. ACFT WERE TAXIING S ON TXWY G (WE WERE FACING N ON TXWY G) ENRTE TO TXWY WJ TO TURN AND LINE UP NBOUND ON TXWY F FOR RWY 18L. WE HEARD THIS; COMPLETED THE AFTER START CHK; AND TOLD GND WE WERE READY TO TAXI. WE WERE GIVEN INSTRUCTIONS TO HOLD SHORT OF TXWY WJ; GIVE WAY TO OPPOSITE DIRECTION TFC; THEN PROCEED N TO TXWY Z TO TXWY HY TO TXWY Y ACROSS THE BRIDGE TO TXWY J TO TXWY EF FOR TKOF ON RWY 17R; FOLLOW AN ACR ACFT. WITH ALL THE ABOVE; TAXIING TO A NEW AND UNFAMILIAR RWY (FOR THIS CREW) IN THE DARK; WE DIDN'T COMPLETE THE BEFORE TKOF CHK. AS WE WERE CLRED FOR TKOF AND APPLIED PWR; THE TKOF WARNING HORN SOUNDED AND IMMEDIATELY REALIZED THAT THE FLAPS HAD NOT BEEN EXTENDED FOR TKOF. OUR SPD AT THIS POINT WAS LESS THAN TAXI SPD AND WE NOTIFIED TWR; CLRED THE RWY AT TXWY EH (AT THE END OF RWY 17R). WE COMPLETED THE BEFORE TKOF CHK AND MADE A NORMAL TKOF AND DEP. THERE WERE MANY DISTRS LEADING UP TO THIS INCIDENT WHICH SHOULD HAVE BEEN WARNING SIGNALS. THERE WAS A TIME PRESSURE ELEMENT; WE WERE RUNNING LATE AND KNEW WE HAD AN AIRPLANE CHANGE IN A SHORT GND TIME IN DENVER BEFORE OUR NEXT FLT. THE APU AND THE NECESSITY FOR THE XBLEED START PRECLUDED THE NORMAL FLOW OF CALLING FOR FLAPS AND THE BEFORE TKOF CHK AS WE TAXI FROM THE GATE. THIS IS NOT THAT UNCOMMON THOUGH; AND IT SHOULD HAVE HAPPENED IN THE SAME SEQUENCE WHEN WE CALLED FOR TAXI AFTER THE START. IN THAT CASE; I WAS DISTR BY CALLING FOR TAXI; SO GND CTL KNEW WE WERE READY TO MOVE. IMMEDIATELY AFTER THAT CALL WE WERE GIVEN A COMPLICATED TAXI RTE WITH HOLD SHORT AND FOLLOW INSTRUCTIONS AND WE WERE CONCENTRATING ON FINDING THE TXWYS IN THE DARK. TAKING A FEW SECONDS TO CALL FOR AND POS THE FLAPS BEFORE CALLING FOR TAXI WOULD HAVE SAVED MORE TIME THAN THE WAY THINGS WORKED OUT. APPARENTLY ALL THIS ACTIVITY MADE ME FEEL THAT WE HAD DONE THE BEFORE TKOF CHK SO WHEN WE WERE AT THE END OF THE RWY WE WERE READY TO GO. I WAS QUITE DISTURBED BY THIS INCIDENT AND UNPLEASANTLY SURPRISED BY HOW EASILY I COULD BE DISTR AND NEGLECT A CRITICAL ELEMENT OF FLT. I HAVE ADDED A PERSONAL VERBALIZED CHK OF TKOF CONFIGN WHEN I NOW TAKE THE RWY FOR TKOF.