What was found
THREE (3) HOURS INTO FLIGHT, THE CAPT FMC SCREEN WENT BLANK FOR SEVERAL SECONDS, THEN A YELLOW/ GREEN BITE TEST DISPLAYED MOMENTARILY BEFORE FMC DISPLAY NORMALIZED. NO VTK DISPLAYED ON MAP; GOT FMC P/ST LIGHT. THE SCREEN CONTINUED TO BLANK OUT 4 OR 5 MORE TIMES. THE "CALL, "FAIL". "MSG", "OFST" LIGHTS ALONG SIDE OF FMC BOX ILLUMINATED. GROUNDED - YES. RUN B737-900 FIM 34-61 TASK 836 CYCLED POWER TO FMCS COMP 1. OPS RESTORED. NO FAULTS SHOWN.