Microsoft’s blue screen of death (BSOD) is an institution in the Windows world and has long served as the signal that something is very wrong with the OS. Over the years Microsoft has updated the screen with more precise explanations for what went wrong, but the screen has almost always been blue. 

It’s the first major change to the BSOD since Microsoft added a sad face to the screen in Windows 8 in 2012, and QR codes in 2016. Microsoft first introduced the BSOD in Windows 3.0, offering a way for IT professionals and support personnel to diagnose hardware and memory faults. A BSOD is Windows’ own kernel error or bug check, and it usually includes a dump of data that can help system administrators analyze what system fault caused the blue screen.

But in Windows 11, which Microsoft released a week ago to Windows Insiders testers, the B in the BSOD acronym has changed from blue to black. Its not massive change but an unfamiliar change for too familiar .

Microsoft is overhauling many parts of Windows 11, with a fresh approach to the OS. It’s likely because Windows 11 includes a visual overhaul to modernize the OS in key areas, including classic parts like the Start menu, File Explorer, and now even the BSOD.