by Jonathan Amos BBC science correspondent, Kennedy Space Center 
endeavour's crew head the last mission of the NASA shuttle endeavour was moved back to their quarters in the AstroVan for the postponement of at least 72 hours due to technical problems has.The orbiter hydraulics is kept on the ground, while engineers investigate a hitch in a unit, the powers of the vehicle.
The youngest of America's reusable spacecraft is set to a $2 billion (£ 1.2 billion) Particle physics experiment on the international space station (ISS) provide.
U.S. President Barack Obama was due to lift off in Florida.
Also available at the Kennedy Space Center endeavour Commander Mark Kelly's wife Gabrielle Giffords, the politician in the head by an armed man shot Arizona in January.
The lift-off had local time for 1547 (1947 GMT; 2047 BST) specifically was, but moved shortly after noon.
Kelly and his crew had to appropriate and have been, the their way to the shuttle. By tradition, their "AstroVan" would usually stop briefly outside Kennedy's launch control centre above continue up on the pad, but on this occasion was drawn to the building and parked the vehicle.
Moments later was called the "Macchia".
Managers and engineers are now discussing how long a turn around they need to deal with what appears to be associated with one of the three auxiliary power units endeavour to an electrical problem.
A heating, freezing in a fuel line will prevent the unit stopped. A further heating was also show unusual behavior.
Suspect at the heart of failure may be a short in an electric switchbox NASA managers, but they are not sure know until engineers within the shuttle can get to make the device.
"" As we say in this business"we will not fly, before we are ready", shuttle launch said Director Mike flax Brook.
Local police expected up to 750,000 people, close to the Kennedy spaceport, had seen to collect the introduction. Interfere with the retirement of the shuttle program has drawn great interest in the final flights of the orbiter.
The discovery ship was the first with a mission in February bow out. It is now dismantled is made safe Museum exhibition.
Endeavour is next. After his 14-day journey of the space station, it will be prepared for exhibition in a Science Centre in California.
The Atlantis Orbiter the shuttle program ends with a mission in June or July.
President Obama made its way to Florida from a tour of the tornado-ravaged State of Alabama as endeavour was stand down.
But he decided to make the journey of Kennedy, take time to talk with staff and check out the equipment. Mr Obama was taken, you will find Atlantis in the building, where it is being prepared for flight.
Jonathan.Amos-Internet@BBC.co.UK
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