Blue screen errors, or stop errors or bug checks, show a stop code and a hexadecimal code. They tell the type and source of the error. For example, VIDEO_TDR_TIMEOUT_DETECTED is a video driver issue, PAGE_FAULT_IN_NONPAGE_AREA is a memory issue, CRITICAL_PROCESS_DIED is a system process issue, etc. You can learn more about your stop code at Bug Check Code Reference.