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The Space Exploration Technologies Corp (SpaceX) Dragon spacecraft has aborted the launch from Space Launch Complex 40, Cape Canaveral at T-minus 3 minutes.
Launch may be rescheduled to the second launch window.

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Launch of the SpaceX COTS Demo 1 spacecrafthas been rescheduled to 9:06 EST, 15:06 UTC.

T minus 02:35:00....Poll stations to proceed with countdown master auto sequence, fuel and oxidiser loading
T minus 01:40:00....Lower strongback umbilical tower
T minus 01:00:00....Allow countdown auto sequence to proceed with Stage 2 fuel bleed and thrust vector control bleed
T minus 00:13:00....Poll by SpaceX launch director
T minus 00:11:00....Logical hold point
T minus 00:10:00....Begin terminal countdown sequence
T minus 00:09:43....Open prevalves to chill down first stage Merlin engine pumps
T minus 00:06:17....Issue command to align flight computer
T minus 00:05:00....Terminate loading of gaseous nitrogen into second stage

T minus 00:04:46....Transfer first and second stages to internal power
T minus 00:03:11....Arm flight termination system
T minus 00:03:02....Terminate liquid oxygen propellant topping
T minus 00:03:00....Verify movement of second stage thrust vector control steering actuators
T minus 00:02:30....SpaceX launch director verifies "go" for launch
T minus 00:02:00....Range verifies "go" for launch
T minus 00:01:35....Terminate loading of helium pressurant
T minus 00:01:00....Command flight computer to start-up state and turn on pad deck water deluge system
T minus 00:00:50....Check first stage thrust vector control steering actuators
T minus 00:00:40....Pressurise first and second stage propellant tanks
T minus 00:00:03....Command first stage engine ignition sequence
T minus 00:00:00....Liftoff

Source: SpaceX