A DSNDING B737-700 FLC FAILS TO MAKE THEIR XING RESTR WHEN DISTR WITH A MINOR EQUIP PROB PRIOR TO SCOLE INTXN; AZ.

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ON THE SFO-PHX LEG OF OUR SEQUENCE WE WERE GIVEN A CLRNC TO CROSS SCOLE INTXN AT FL290. THE FO WAS FLYING AND IMMEDIATELY STARTED HIS DSCNT. DURING THE DSCNT THE FO'S SIDE MAP DISPLAY WAS LOST. SINCE HE WAS IN THE DSCNT I STARTED TO TROUBLESHOOT THE PROB. I SHOULD HAVE PAID CLOSER ATTN TO HIS DSCNT RATE AND WOULD HAVE CAUGHT THE IMPENDING ALTDEV BEFORE IT OCCURRED. I WAS GOING THROUGH THE CHKLIST WHEN ATC INFORMED US THAT WE HAD MISSED THE XING RESTR AND ASKED IF WE COULD EXPEDITE OUR DSCNT. LATER; AFTER SWITCHING THE DISPLAY'S TO BOTH ON; AND BACK TO NORMAL; THE MAP DISPLAY RETURNED FOR THE REMAINDER OF THE FLT. I SHOULD NOT HAVE LET A SMALL PROB; LIKE LOSING THE FO'S MAP DISPLAY; DISTRACT ME FROM THE MORE IMPORTANT DUTIES OF FLYING THE ACFT. SUPPLEMENTAL INFO FROM ACN 472152: THE FMC INDICATED 12 MI FROM TOP OF DSCNT WHEN THE CLRNC WAS ISSUED; AND I INITIATED A 1000 FPM DSCNT TO INTERCEPT THE NORMAL PROFILE. THERE WAS NO CONFLICTING TFC AS THE TCASII INFO WAS STILL BEING DISPLAYED. WITH RAW DATA AND THE CAPT'S MAP AVAILABLE AND BEING DISPLAYED; I BECAME PREOCCUPIED WITH STUFF THAT REALLY DIDN'T MATTER. I WILL ADMIT THAT I WAS FATIGUED DUE TO THE 2 HR DELAY INTO SFO AND FURTHER DELAYS IN REACHING MY HOTEL ROOM THE NIGHT BEFORE. ARRIVING AT SFO FOR THIS FLT; WE DISCOVERED THAT WE WOULD FACE A 2 HR AND 30 MIN DELAY FOR DEP. THIS DELAY ADDED TO THE FATIGUE I WAS EXPERIENCING.