A B757 CREW REJECTS A TKOF FOR A CONFIGN WARNING AT INITIAL PWR APPLICATION SUBSEQUENTLY DISCOVERING THAT THEY HAD NOT COMPLETED THE TAXI CHKLIST AND FLAPS WERE NOT EXTENDED.

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DURING TAXI OUT; THE FO INITIATED THE FLT CTL CHK AND THEN INPUTTED TKOF DATA INTO THE FMC FROM THE CLOSEOUT WT SLIP. THERE WAS A DISCUSSION ABOUT SHUTTING DOWN AN ENG DUE TO ATC DELAYS. GND CTL CALLED SEVERAL TIMES WITH UPDATED TKOF SEQUENCES. FINALLY CLRED FOR TKOF AND COMPLETED THE BEFORE TKOF CHKLIST. AS THE THROTTLES WERE ADVANCED; THE TKOF WARNING SOUNDED. THE THROTTLES WERE IMMEDIATELY CLOSED AND THE ACFT CLRED THE RWY. A PA ANNOUNCEMENT WAS MADE TO THE PAX. IT WAS DETERMINED THAT THE TAXI CHKLIST HAD NOT BEEN ACCOMPLISHED AND THAT THE FLAPS WERE NOT SET FOR TKOF. NEITHER PLT NOTICED THIS DURING A LENGTHY TAXI. THE TAXI CHKLIST WAS COMPLETED AND A NORMAL TKOF WAS MADE. WHY DID THIS OCCUR? AFTER ANALYZING OUR ACTIONS; THE FOLLOWING THOUGHTS CAME TO MIND: 1) NORMAL SEQUENCE WAS DISRUPTED -- THE FO INITIATED THE FLT CTL CHK BEFORE THE FLAPS WERE EXTENDED. EXTENDING THE FLAPS USUALLY TRIGGERS THE FLT CTL CHK AND THE CALLING FOR THE TAXI CHKLIST. 2) DISTRS: A) CONCERN ABOUT FUEL CONSERVATION DUE TO DELAY AND WHETHER TO SHUT DOWN AN ENG. B) PERSONAL DISTRS -- FO WAS BEING FURLOUGHED AFTER THIS SEQUENCE OF FLTS -- WAS CONCERNED ABOUT EMPLOYMENT PROSPECTS. C) GENERAL STRESS AMONG PLTS CAUSED BY LAYOFFS AND WORSENING WORKING CONDITIONS.