The blue screen of death is a rather terrifying display image containing white text on a blue background that is generated by Windows operating systems when the system has suddenly terminated with an error.
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Slang used to describe the blue Fatal Exception Error screen that appears after a full blown system crash.
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The blue screen of death (BSoD) is the screen displayed by Microsoft's Windows operating system when it cannot (or is in danger of being unable to) recover from a system error. There are two Windows error screens that are both referred to as the blue screen of death, with one being significantly more serious than the other.
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