Step: 1. Press the DEL key on the computer keyboard continuously when turning on the computer, then enter the BIOS, and press the keyboard direction key to select "Advanced BIOS Function".

2. Press Enter on the keyboard to enter, and press the arrow keys on the keyboard to select "Hard disk startup priority".

3. Then enter. By default, the hard disk starts first. Then press the "+"and "-"keys on the keyboard to move the USB option to the top, that is, use USB as the first startup disk.

Tutorial: 1. First, insert the usb boot disk into the USB interface of the computer to restart or boot the computer. When the boot screen with Yingtai brand LOGO appears on the screen, press F9 on the keyboard.

2. At this time, a startup item selection window with a blue background will appear on the screen, in which the startup item selected in the red box is a USB flash drive inserted by Bian Xiao in the computer.

3. Use the direction keys on the keyboard to move the cursor to the USB flash drive startup item, and finally press Enter to confirm to enter the USB flash drive startup main menu interface, as shown in the following figure: