There is a computer boot only PV what 4 and V6 what is not at the beginning of the USB, determine the U disk. Other computers are normal, the model is 5521, no matter how modified, there is no USB startup.
When DELL Logo appears, press F12 and "hard"......" There's a "USB" below......" Options
Machine factory pre installed win8, want to use the system disk to install win7 system, boot by F12, enter the boot startup options, found that there is no boot from CD/DVD options, to teach you how to solve this problem:1. boot press F2, enter BIOS2., in the BIOS menu under Boot, change Secure Boot to Disabled3. change Boot, List, Option to LegacyPress F10 to save, reboot, press F12 to see the boot options.
DELL notebook BIOS U disk boot settings tutorial:1, press the boot button, when the computer appears boot screen, press F2 to enter the BIOS settings interface.2, go to the BIOS settings window, move the cursor to "boot", and then move the cursor to "1st Boot Priority" to enter to confirm.3. After the carriage return is determined, pop up the 1st boot priority option window, move the cursor, select "USB storage device", and then enter the carriage to confirm.4, after the settings have been completed, users can simply press F10 to save and exit.
