مشکل بوت نشدن cents 6-4

Boot failure : No DEFAULT or UI configuration directive found Error
Reason for the Error :

Generally the iso image that are intended to be burned and booted from CD/DVD has all the files required for Boot in the “ISOLINUX” folder. Whereas the iso images that are intended to be run from USB has all the files required for boot in the “SYSLINUX” folder. So when you try to burn and boot a CD/DVD iso from USB, it cannot recognize the type of boot medium as it will not have “syslinux” folder it will simply give “Boot failure : No DEFAULT or UI configuration directive found“.
Solution for the Error :

Open the USB installation media, then rename the following:

isolinux –> syslinux (folder)
isolinux.bin –> syslinux.bin
isolinux.cfg –> syslinux.cfg