Black Screen of Death
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It has been suggested that this article or section be merged with Screens of death. (Discuss) |
The black screen of death (BlSoD), is either of two things:
- a failure mode of Microsoft Windows 3.x, or
- the screen displayed by the OS/2 operating system in the event of either a system error from which it cannot recover (a TRAP screen) or a "hard" error in a program running in "full screen" mode (a less serious application failure).
The black screen of death has been present in all versions of OS/2.
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[edit] The Windows black screen of death
[edit] Windows 3.x
In Windows 3.x the black screen of death is the behaviour that occurred when a DOS application failed to execute properly. It was often known to occur in connection with attempting certain operations while networking drivers were resident in memory. (Most commonly, but not exclusively, it was seen while the Novell NetWare client for DOS, NETX, was loaded.)
The system would switch the display to text mode, but would display nothing, leaving the user looking at an entirely black screen with a blinking cursor in the upper left corner. At this point, the user could do nothing but perform a cold reboot to get the system running normally again.
According to Wallace McClure of ASP.net[1], the phrase was originally coined in the summer of 1991 by Ed Brown, a technician with Coca-Cola Company's IT department in Atlanta, GA. He reports that the company was rolling out Windows 3.0 within the Global Marketing group and when the users would attempt to run WordPerfect, they would randomly receive a BlSOD.
[edit] Later versions of Windows
Windows 95, 98, 2000, ME, XP, and the official release of Windows Vista also display a Black Screen of Death when the operating system cannot boot. This is usually due to a missing file. Often the user must reinstall Windows. If the missing file is critical to the boot process, however, more often than not the boot screen will inform the user of the missing file.
In other cases, the black screen of death was replaced with the Blue Screen of Death.
A black screen can also be caused by display driver problems, or selecting a mode that the monitor cannot display, though this may result in a warning on the monitor, or even in damage to a CRT monitor if it is not protected against excessive scan rate.
[edit] The OS/2 Black screen of death
In OS/2, a black screen of death is either a "TRAP screen" or "full-screen hard-error VIO pop-up". They switch the display adapter to text mode. The display is 80 columns by 25 rows, with white lettering on a black background and a black border, and uses the text mode font of the display adapter.
[edit] TRAP screens
A "TRAP screen" occurs when the kernel encounters an error from which it cannot recover, a system crash. Usually this is a result of faulty (or overclocked) hardware or a hardware malfunction, but it may also result from a software error in either the kernel or a device driver.
The "TRAP screen" contains a dump of the processor registers and stack, and information about the version of the operating system and the actual processor exception that was triggered.
The only actions the user can take in this situation is to perform a soft reboot by pressing Control-Alt-Delete or to perform a system dump by pressing Control-Alt-NumLock twice.
[edit] Hard error screens
A "full-screen hard-error VIO pop-up" occurs when a process incurs a "hard" error, either an outright application program crash or a potentially recoverable hard error (such as an attempt to access a floppy disc device where no disc has been inserted into the drive).
The screen is displayed by the "hard error daemon" process, which handles hard errors from all other processes. Technically, the screen is a "VIO pop-up" screen. All processes (except the one that has incurred the error, any that also incur hard errors whilst the first error is being displayed, and any that themselves wish to display a "VIO pop-up" screen) continue to run, and the system continues to operate as normal. The hard error daemon uses a VIO pop-up when either the system has been booted into text mode or the hard error has occurred in a process running in a full-screen session.
The "pop-up screen" contains information about the processor exception that was triggered and the identity of the process.
The user is prompted for the action to be taken, and may choose
- to end the process,
- to display more information (which comprises a dump of the processor registers and stack for that process),
- to retry the operation (if appropriate — I/O errors are retryable, CPU errors are not), or
- to ignore the problem and continue (if appropriate — I/O errors are ignorable, CPU errors are not).
[edit] Wii
The Wii video game console also displays a black screen of death when there are hardware or disc problems.
[edit] Nintendo DS
A "black screen of death" can occur at the very beginning of a Metroid Prime Hunters match. The Nintendo DS's screens turn black and the system must be shut off to fix the problem (which can result in the player's connection history dropping).
[edit] References
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