Why Chandrayaan failed?

At at 0025 hours IST on Saturday, 29-August-2009 the ISRO's deep space network abruptly lost radio contact with Chandrayaan-1, India's first moon mission satellite. All attempts to reestablish contact failed.
So what exactly went wrong with Chandrayaan? "We had to terminate the mission as we don't have contact with the spacecraft. Though we are disappointed with what has happened, we have managed to salvage a large volume of data," Indian Space Research Organisation (ISRO) Chairman G Madhavan Nair said.
Earlier, M Annadurai, the Project Director of the Chandrayaan-1 mission, had stated that ISRO will conduct a detailed review of the telemetry data from Chandrayaan-1 to diagnonise the cause of the satellite's malfunction. According to preliminary reports, the critical star sensor of the Chandrayaan-1 along with the on board computers and antennae began to malfunction. Before it malfunctioned, Chandrayaan was orbiting 200 kms from the moon, the satellite will collide with the moon's surface in about 1,000 days.
"Our expert team has come to a conclusion that it is not possible to restore the radio link, as the computers onboard the spacecraft for controlling the mission are non-functional for various reasons. Without the computers functioning, the mission cannot proceed," Nair said, "the power signals which go to the computer systems failed and we had to terminate the mission."
However the mission was largely successful as chandrayaan managed to record 95 percent of the desired data. "The moon mission was a great success and 95 per cent of its objective was completed. We could collect a large volume of data, including 70,000 images of the moon," Nair said. According to ISRO director S Satish, Russian and American radars will be used to track Chandrayaan's position and orbit. Satish admitted that the suggested two year was premature and that appropriate measures were taken so hat the spacecraft recorded the data ahead of its schedule. "None of the lunar missions has been for more than a year. Many of them last six-seven months whereas our mission lasted for about 10 months against heavy odds, including the hostile lunar environment, solar radiation and other variations in the space," Satish said.
The moon mineralogy mapper, terrain mapping camera and hyper-spectral imager equipped on the Chandrayaan were very successful and raised the bar higher for scientific research in India. "We have achieved the engineering or technology objectives of the mission by flying the spacecraft 400,000 km to the moon, inserting it into the lunar orbit and placing the Indian tricolour on the lunar surface Nov 14 without hitch," Nair noted.
ISRO director S Satish was upbeat about the results produced by Chandrayaan-1. "We have received excellent data from all the 11 instruments and the scientific community and the international agencies participating in the mission are very happy with the quality of the data," Satish claimed.

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