ACR-MDT ROLLED FORWARD AND HIT POWER CART AS THE EXTERNAL CONNECTIONS WERE BEING REMOVED IN PREPARATION FOR FOR DEP.

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PROCEEDED THROUGH THE NORMAL EXTERNAL AND INTERNAL CHKLISTS. THE F/O DID THE EXTERNAL PREFLT. I PROCEEDED TO COMPLETE THE INTERNAL CHKLIST AND READY ALL THE NECESSARY WT AND BALANCE FORMS. I FINISHED THE PRE-DEP CHKLIST. AT THE POINT OF SETTING THE PARKING BRAKE IN THE CHKLISTS. I SET IT; THEN IT RELEASED ITSELF. INSTEAD OF RESETTING IT; I ELECTED TO LEAVE IT OFF AFTER NOTING THE PNEUMATIC PRESSURE IN THE MAIN AND BRAKE SYS. AT THIS POINT; WE HAD APPROX 1900 PSI IN THE SYS--JUST ENOUGH TO TAXI TO THE RWY AND TKOF WITH THE MINIMUM REQUIRED 1500 PSI. EARLIER IN THE DAY; THE F/O NOTED THE LEFTHAND OUR BOARD ANTISKID WAS SLOW TO RESPOND DURING THE TEST; INDICATING THERE WAS A SLOW RELEASE OF AIR FROM THE PNEUMATIC SYS ANYTIME THE BRAKES WERE APPLIED. ON OUR DEP FROM BRADLEY IN THE MORNING; WE HAD CHARGED THE SYS WITH ONE ENGINE RUNNING WITH NO RESULTS FOR 20 MINS. THEN WE DID THE SAME WITH 2 ENGS RUNNING FOR APPROX 25 ADDITIONAL MINS; AFTER WHICH WE FINALLY OBTAINED THE TKOF MINIMUM OF 1500 PSI. WHILE CHARGING WITH 2 ENGS; THE F/O AND I TOOK TURNS HOLDING THE RIGHT BRAKE ONLY. I DID NOT USE THE PARKING BRAKE BECAUSE OF THE POSSIBLE LEAK. WHILE DOING ONE OF THE CHKLISTS; I NOTICED A RAMP AGENT REMOVING THE CHOCKS W/O ANY PRIOR PERMISSION OR SIGNAL FROM MYSELF. I YELLED AT HIM TO PUT THE CHOCKS BACK SINCE THE BRAKES MAY NOT BE SET. THE RAMP AGENT ACKNOWLEDGED THE COMMAND TO REPLACE THEM. I STARTED THE ENG IN THE USUAL ORDER--#2 THEN #1. AFTER PUSHING THE START BUTTON FOR #1; I LOOKED OUT MY WINDOW THERE WAS A RAMP AGENT (#2) WALKING UNDER THE LH WING. I OBSERVED THIS #2 RAMP AGENT GESTURING TO THE RAMP AGENT WHO HAD CLRED US FOR START. THE ONLY PART I UNDERSTOOD WAS THAT THE AFT DOOR WAS NOT SHUT. THE F/A CLOSED THE DOOR RIGHT AS THE LH ENG WAS STARTING. AFTER BOTH ENGS WERE STARTED; I CALLED FOR THE AFTER STARTING CHKLIST. AFTER SWITCHING TO INTERNAL PWR; I SIGNALED FOR APU DISCONNECT USING APPROPRIATE SIGNALS. I RETURNED TO THE COCKPIT OVERHEAD TO TURN ON THE REST OF THE SYSTEMS. AS I WAS TURNING ON THE ALTERNATORS; THERE WAS YELLING THAT THE ACFT WAS MOVING. I IMMEDIATELY STOMPED ON THE BRAKES. SIMULTANEOUSLY; I HEARD THE SOUND OF CRUNCHING METAL FROM THE RIGHT SIDE OF THE ACFT. IMMEDIATELY I FEATHERED BOTH ENGS AND PULLED THE RIGHT ENG T-HANDLE (FIREWALL SHUT OFF FOR THE FUEL SYS). THE F/O CALLED FOR AN EVAC AS I SHUT THE ENGS DOWN. AT NO TIME DURING THE SEQUENCE OF EVENTS DID I GIVE THE AGREED UPON AND ACCEPTED SIGNAL FOR THE REMOVAL OF THE CHOCKS. IN MY OPINION; IF THE CHOCKS HAD REMAINED PROPERLY IN PLACE; THE ACFT NEVER WOULD HAVE MOVED.