AN AIRBUS 300 ON TAKEOFF AND UP TO 1000 FT INERTIAL REFERENCE SYSTEM WOULD NOT ACCEPT NAVIGATION AND HEADING SELECT INPUTS. REQUIRED MANUAL OP.

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THE ACFT WAS HAVING PROBS ALL DURING PREFLT. SOME MAINT WAS BEING DONE BEFORE WE ARRIVED. DURING PREFLT; THE ACARS WAS FROZEN; COULDN'T RESET CLOCKS; COULDN'T GET IRS'S TO ALIGN EVENTUALLY IT LOOKED LIKE IT ALIGNED; BUT DURING TAXI WE LOST IT AGAIN. RETURNED TO GATE FOR MAINT. MAINT HAD TO LOAD IN THE COORDINATES MANUALLY TO FIX IT. ON CAPT'S TAKEOFF HE SELECTED NAV AND IT WOULD NOT SELECT. ATTEMPTED AGAIN NO LUCK. ON THIRD TRY IT SELECTED BUT PLANE BEGAN A R TURN INSTEAD OF L. CAPT DISENGAGED NAV SELECTED HEADING SELECT. HEADING BARS SHOWED A R TURN ALSO CAPT DISENGAGED AND BEGAN L TURN AT THE SAME TIME TWR TOLD US TO TURN L TO 130 DEGS THEN CAME BACK AND SAID L TO 180 DEGS. THEY CAME BACK AND TOLD US WE DIDN'T TURN IN TIME AND 'NO HARM NO FOUL; BUT DON'T DO IT AGAIN.' I DIDN'T HAVE TIME TO EXPLAIN WHAT HAPPENED AND JUST SAID OK. I CHKED THE DATA WE LOADED AND IT WAS ALL CORRECT. THE PLANE JUST DIDN'T SEEM TO KNOW WHERE IT WAS OR WHERE IT SHOULD GO WE MAY HAVE WAITED TOO LONG TO TAKE OVER MANUALLY; BUT IT ONLY TOOK A FEW SECONDS TO TRY TO SELECT NAV AND HEADING SELECT.