# Black screen of death

The black screen of death is a screen displayed on many computer systems after encountering a critical system error.
Some versions of Microsoft Windows (and to a lesser extent, macOS) also display a black screen of death upon fatal system errors, usually caused by several factors.

## Microsoft Windows
### Windows 3.x

In Windows 3.x, the black screen of death is the behavior that occurred when a DOS-based application failed to execute properly. It was often known to occur in connection with attempting certain operations while networking drivers were resident in memory. (Commonly, but not exclusively, it was seen while the Novell NetWare client for DOS, NETX, was loaded.).
The issue was fixed in most instances by adding an additional section in the SYSTEM.INI of affected clients with the text TimerCriticalSection = 10000. The following files were also updated, vtdapi.386re.386 and vipx.38id-1991 by Ed Brown, a technician with the 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 receive a black screen.

### Later versions of Windows

MS-DOS and all versions of Windows after Windows 3.1 (Windows 95, Windows 98, Windows Me, Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10 and Windows 11) also display a black screen of death when the operating system is unable to boot properly. There are many factors that can contribute to this problem, including the ones listed below.
The most common issue contributing to a black screen of death on startup is usually due to a missing file. It also occurs when the user enables file compression on all the files, causing the entire operating system to become compressed and unbootable. Rarely an experienced user would reinstall Windows. In the case of the former, the boot loader will most likely inform the user the name of the missing file, allowing for the user to supply and/or reinstall the missing files to resolve the boot problem. In the case of the latter, however, the computer will not be able to boot, even into safe mode. The only way to resolve this problem is to boot into another device and then uncompress the files from it to make the system bootable again.
In late 2009, several new reports of the black screen in Windows XP, Windows Vista, and Windows 7 emerged. At first, several claims pointed at Windows Update. This was later recanted by Prevx as an erroneous report. Microsoft reported that no security update was causing the issue, and may be tied to malware.
In other cases, the black screen was replaced with a blue screen of death. A black screen may also be caused by certain components of the computer overheating, in place of the traditional blue screen, that appeared to indicate a stop error. This black screen was simplified compared to the previous blue screen, omitting instructions that the user is recommended to take.
Windows 10 and later also displays a black screen due to an unfinished update in addition to the aforementioned causes above; in this case, after the system restarts and the user tries to login to the system, the user is then stuck at a black screen instead. Performing a hard shutdown and then a cold-boot of the system is the only way to resolve this problem.

## macOS

Some versions of macOS (such as OS X Lion) display a black screen of death instead of a kernel panic in the event of a hardware or software failure. This is usually pointed to a graphics card failure or a sleep/wake issue. It may also display a black screen when the operating system is unable to boot properly at startup, similar to that of Windows.