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Description of Driving Event:

The Physics of Colloids in Space (PCS) experiment was launched on ISS Flight 6A in April 2001, was activated in EXPRESS Rack 2 on May 31, 2001, and was successfully operated on the International Space Station (ISS) until February 24, 2002. On February 24, 2002, at the onset of a scheduled operational run on ISS, the PCS flight system computer (within the PCS Avionics Section) failed to boot up. During the March 20, 2002 attempt by the Expedition 4 crew to access and modify corrupted computer settings, a very complex procedure, the Payload Developer (PD) had no direct contact with the crew member, no ISS video services, and heard very little crew positive reporting.