AN MD80 LOSES THE CAPT'S EFIS DISPLAY ON TAXI OUT. AFTER COMPLYING WITH THE PROC IN THE POM AND UNABLE TO FIND ANY REF TO THE INOP #1 EFIS IN THE MEL; THE CREW TAKES OFF FROM ORF; VA.

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WHILE APCHING THE RWY FOR TKOF; THE CAPT'S EFIS WENT BLANK. WE COMPLIED WITH THE POM PROC FOR THIS FAILURE; BUT COULD NOT FIND IT IN THE MEL. AS THE POM STATED THAT WE COULD STILL FLY CAT I APCHS WITH THE EFIS SWITCH IN THE 'BOTH ON 2' POS; AND WE FELT COMFORTABLE COMPLETING THE PLACARDS IN THE AIR; WE CONTINUED THE FLT. MIDWAY THROUGH THE NEXT FLT OF THE DAY; FLT CTL INFORMED US THAT AS THIS ITEM IS NOT LISTED IN THE MEL; WE WERE NOT LEGAL TO TAKE OFF. I FEEL SEVERAL FACTORS CONTRIBUTED TO THIS MISTAKE: PRIMARILY; OUR DESIRE TO MAINTAIN AN ON-TIME OP; MY OWN COMPLACENCY OR 'COPLT' SYNDROME;' THE MEL DOES NOT CONTAIN A LIST OF 'NO-GO' ITEMS THAT ARE NOT INCLUDED IN ITS SCOPE. IT IS A LARGE AND COMPLICATED DOCUMENT AND THIS MADE IT DIFFICULT TO CONCLUDE DEFINITELY THAT SOMETHING IS NOT LISTED (AS OPPOSED TO 'I JUST CAN'T FIND THE ITEM'); ALSO; IN BOTH INITIAL AND RECURRENT TRAINING; IT IS A FAIRLY HIGHLY STRESSED ITEM TO RECALL (FROM MEMORY) 'WHAT SWITCH DO YOU USE TO FIX A SYMBOL GENERATOR AND WHAT APCH MAY YOU STILL FLY?' THIS ENGENDERS A SOMEWHAT CAVALIER ATTITUDE AND BELITTLES THE IMPORTANCE OF A RARELY USED SWITCH. SUPPLEMENTAL INFO FROM ACN 597589: DURING TAXI OUT CAPT'S EFIS (PFD; NAV DISPLAY) GOES BLANK. CHKED FOR POPPED CIRCUIT BREAKERS AND FOUND NONE. AFTER THOROUGHLY CHKING THE MEL; NEITHER I OR THE FO COULD FIND ANYTHING ABOUT EFIS MALFUNCTIONS! MY REASONING WAS IT'S VFR HERE; IT'S VFR AT OUR DEST; MY COMPANY HAS NO MAINT HERE EXCEPT FOR CONTRACT MAINT; WE ARE KEEPING THE OP SAFE; LET'S GO. WRONG! I SHOULD HAVE CONTACTED MY DISPATCHER AND I'M SURE HE WOULD HAVE POINTED OUT THAT I NEED MAINT TO MCO THE CAPT'S EFIS. I KNOW THE MEL APPLIES RIGHT UP TO THE TKOF EVENT; BUT IT SURE WOULD HAVE HELPED IF THE MEL INDEX HAD ANYTHING ABOUT EFIS MALFUNCTIONS. WE FOUND NOTHING. MAYBE SOMETHING SHOULD BE WRITTEN IN ORDER TO TAKE THE DOUBT OUT OF ANY CAPT'S MIND! LESSON LEARNED!