B737-300 FLT CREW DURING PUSHBACK/TAXI HAS MULTIPLE MALFUNCTIONS; RECEIVES A TKOF WARNING; RESETS FLAPS AND CONTINUES THE FLT.

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ARRIVED AT THE ACFT; STARTED MY CAPT PREFLT CHECKS. I FOUND THE #1 MAIN FUEL GAUGES INOP. MAINT WAS CALLED. WE PULLED OFF THE GATE ON TIME. AFTER ENG START; THE #1 ENG GEN WOULD NOT COME ON LINE. A TERRAIN SYS FAIL LIGHT CAME ON. I GOT THE #1 GEN ON LINE. WE RAN A SYS TEST. THE TEST SHOWED A GPS INTERNAL FAILURE. WE ATTEMPTED AN IRS QUICK ALIGN. THE FAIL LIGHT STAYED ON. I CONTACTED MAINT. I TOLD THEM ABOUT THE SYS FAIL LIGHT. THEY ASKED IF I WAS COMING BACK TO THE GATE. THE FO TOLD ME THE LIGHT WAS OUT. I SAID YES. ONE OF OUR COMPANY ACFT CAME ON THE AIR AND ASKED ME WHEN I WAS MOVING. HE WAS BLOCKING ME FROM GOING TO THE GATE. THE FO TOLD ME THE LIGHT WAS OUT. I TOLD HIM OK; LET'S GO. GND CTL TOLD US TO GO TO THE PAD. WE WERE STILL TAXIING WHEN TWR CLRED US FOR TKOF. I CALLED FOR THE BEFORE TKOF CHECKLIST; TAXIED ON THE RWY; STARTED SETTING TKOF POWER; THEN THE TKOF WARNING HORN CAME ON. I LOOKED AT THE FLAPS AND THEY WERE UP. WE CLEARED THE RWY; SET THE FLAPS; CHECKED THE SYSTEMS; LOOKED AT THE FOM; AND WROTE AN INFO ONLY IN THE LOGBOOK. WE THEN DEPARTED LAS. I FELT TERRIBLE THAT I MISSED THE FLAPS AND DID NOT CALL FOR THE BEFORE TAXI CHECKLIST. I FELT BAD FOR MY FO BECAUSE HE DOES A GREAT JOB. AT CRUISE; WE TALKED ABOUT WHAT HAPPENED. WE BOTH FELT LIKE WE WERE CONSUMED BY THE FAIL LIGHT. I HAD IT IN MY MIND WE WERE GOING BACK TO THE GATE. WE DECIDED WE SHOULD HAVE STARTED THE CHECKLISTS OVER; NOT RUSHED; CONTROLLED OUR MISSION. SUPPLEMENTAL INFO FROM ACN 698703: AT CRUISE; WE DISCUSSED WHAT LED TO THE TKOF WARNING HORN. A GENERATOR NOT COMING ON LINE; WITH THE POWER CYCLING AND TERRAIN FAIL INDICATION; TOOK OUR ATTENTION AWAY FROM OUR CURRENT FLOWS AND NORMAL HABIT PATTERNS. MULTIPLE ATTEMPTS TO TROUBLESHOOT AND ATTEMPTING TO TAXI BACK TO THE GATE FURTHER REMOVED US FROM NORMAL HABIT PATTERNS.