FLC FAILED TO COMPLETE ENG START ON ONE OF TWO ENGS PRIOR TO ATTEMPTING TKOF.

Narrative

DEPARTING DFW WE PUSHED BACK FROM GATE WITH TOW TO GATE X FOR START. LOT OF SAAB TFC ON RAMP. CLR TO START ENG NORMAL START. WENT TO START. FO REMARKED ABOUT SAAB TFC ON L. GND CREW CALLED FOR PARK; I CLRED THEM. FO WAS LOOKING IN KIT BAG. I NOTICED ENG START SWITCHES WERE STILL ON. I THOUGHT IT ODD I DID NOT TURN THEM OFF AFTER ENG START. I NOW BELIEVED THAT ENG #2 WAS RUNNING. FO HAD PUNCHED OUT START ANNUNCIATOR PANEL. WE TAXIED TO RWY 17R; GOT IN LINE; ACFT WAS LIGHT SO THE PULLING TO R I THOUGHT COULD BE WIND OR JUST TRACKING. WE WERE CLRED INTO POS; CLRED FOR TKOF. AS I ADD PWR THE EPR ON ENG #2 WAS NOT COMING UP. WE LOOKED AT THE ENG AGAIN AND FOUND IT WAS SHUT DOWN. I IMMEDIATELY CLRED THE RWY AND STARTED ENG #2. ALL TAXI CHKLISTS HAD BEEN PERFORMED NORMALLY. WITH THE START ANNUNCIATOR PANEL NOT IN BACKUP THERE IS NO OTHER ENG OUT INDICATION ON TAXI; OTHER THAN MY NOT SEEING AN ENG NOT RUNNING. THE REST OF THE FLT WAS NORMAL. IN ABOUT 10000 HRS OF FLYING I WOULD HAVE NEVER BELIEVED I COULD DO THIS. I GOT DISTRACTED BY TFC; THE OTHER THINGS GOING ON AROUND OUR JOBS; AND FAILED TO LEAD WHEN THE FO WANTED TO TURN OUT THE START ANNUNCIATOR PANEL WHICH IS NOW PROC.