发生Black Screen时必要的操作：（ ）

A、Press the Caps lock/Num lock key and check if the LED is responsive
B、Connect to an external monitor and press hotkey “Win key + P” four times to check if the system can switch between different display modes
C、If no memory dump file is generated, please try manually triggering BSOD via combination key or NMI key.
D、Take the picture once Black Screen occur