1. After pressing the power key, continue to press the F2 key on the keyboard. I suggest you continue to press it. It may be too late to wait until the prompt interface pops up. As shown in the figure below:
2. This will enter the BIOS interface of the computer. As shown in the figure below:
3. At the bottom of the screen, some keys involved in basic operations are displayed. For the startup problem, you can directly press F8 on the keyboard. As shown in the figure below:
4. After pressing the F8 key, a window will pop up with two startup options. Select the content to start by pressing the up and down keys on the keyboard, for example, select the USB flash drive below to start this time. As shown in the figure below:
5. After selection, press enter to start the USB flash drive, as shown in the figure below: