BSOD stands for Blue Screen of Death. This is a Windows stop screen that tells you an error has occurred that it was unable to recover from. It’s called a Blue Screen of Death because you must restart the system in order to get everything going functioning again. The BSOD contains important information for troubleshooting. This information is also written to the event log in Windows.
For Mac OS, the equivalent to a BSOD is a spinning pin wheel. This is called the macOS X Spinning Wait Cursor. It functions as feedback to let the user know that something is happening. Sometimes the spinning pin wheel goes away and you can regain control of your operating system. But sometimes he spinning pin wheel never stops and you must reboot. Some possible reasons for an endless spinning pin wheel is an application bug, bad hardware, or slow paging to disk.
Check the console logs to determine why the spinning pin wheel occurred.
