CAPE CANAVERAL, Fla. (April 14, 2014) With less than two hours remaining in the countdown Monday, Space X scrubbed Monday's scheduled launch of a capsule loaded with supplies for the International Space Station.
The next launch attempt can come no earlier than Friday.
There was no immediate explanation for the postponement.
The launch already had been delayed a full month.
NASA decided Sunday to go ahead with the launch, despite a computer problem on the orbiting lab.
The computer, situated on the outside of the orbiting lab, stopped working Friday.
NASA debated whether to delay the SpaceX mission, but on Sunday determined the station can accept the visiting craft.
A spacewalk will be required, meanwhile, to replace the bad computer.
Engineers don't know why it failed.
NASA station program manager Mike Suffredini says the spacewalk will be conducted April 22, which gives SpaceX two windows to get its Dragon capsule flying.
The SpaceX Dragon capsule will be making its fourth trip to the space station from Cape Canaveral, Fla.
The launch was postponed twice last month, the last time because of an electrical short on Air Force ground equipment.
The unmanned capsule is loaded with transport legs for the station's humanoid robot, a grow lamp for vegetables in orbit and 5,000 pounds of supplies and experiments.
The California-based company will also test landing legs for the return of the first stage of the Falcon 9, the rocket it uses to launch the capsule
SpaceX tests its rocket motors at its facility in McGregor, west of Waco.