The solution is as follows:

1. First, when the computer is turned off, insert the U disk boot disk into the usb port of the computer, and then turn it on.

2. After the computer is turned on, press F2 of the keyboard to enter the BIOS of the computer. Use the left and right keys or the up and down keys of the computer keyboard to move the cursor to the guidance position, and then press enter.

3. After entering, move the cursor to the position of the U disk startup disk, and then press F5 or F6 key of the keyboard to move the startup U disk to one line, which is the first startup item.

4. Use the move button to move the cursor to the exit position, and then select the exitSavingChanges option to save the changed settings.

5. After the computer restarts, you can enter the USB flash drive startup interface.

Extended data:

Matters needing attention when starting with USB flash drive:

1, the USB flash drive must work normally without damage.

2. You need to make a USB flash drive with USB flash drive depth software;

3. The downloaded system image file should be placed in the root directory of the U disk.

4. The usb flash drive needs to be plugged into a USB socket that can be used normally.

5. Pay attention to the direction when inserting the USB flash drive. In case it doesn't fit in, don't push. You can solve the problem by changing the direction. And don't plug it in immediately after unplugging it, wait for about 5 seconds before plugging it in.