A "black screen" refers to a situation where a display device, such as a computer monitor, television, or smartphone, shows nothing but a black or dark screen. This can be caused by a variety of issues, ranging from simple problems like a disconnected cable or low brightness setting to more complex hardware or software failures. Troubleshooting a black screen often involves checking power connections, testing different cables and displays, and potentially restarting the device or performing more advanced diagnostics. While sometimes indicating a serious problem, a black screen can also be a temporary glitch resolved with a simple fix.