Pressing F8 key during startup is the most traditional and commonly used method: turn on the computer power supply, immediately press F8 key on the keyboard after the hardware completes self-checking, and many advanced startup options are listed here. In this security mode, there are several types. Generally speaking, you can choose to enter the common security mode. In addition to this most commonly used method, you can also start the system in "safe mode" by holding down the Ctrl key when the computer starts.