A computer that monitored drilling operations on the Deepwater Horizon had been freezing with a "blue screen of death" prior to the explosion that sank the oil rig last April, the chief electronics technician aboard testified Friday at a federal hearing."Blue screen of death," or BSOD, is a term most often used to describe the display shown by Microsoft Windows after a serious crash that has incapacitated a PC.In his testimony Friday, Michael Williams, the chief electronics technician aboard the Transocean-owned Deepwater Horizon, said that the rig's safety alarm had been habitually switched to a bypass mode to avoid waking up the crew with middle-of-the-night warnings.

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