If you format the hdd, uefi bios would not find the EFI partition containing Windows boot manager, therefore it would not show hdd in boot list.  UEFI boot list can only show uefi bootable devices such as usb mass storage containing Windows 10 installation media, Windows 10 installation dvd (if you disable secure boot otherwise dvd would not show because it thinks the dvd is a foreign insecure device), or hdd that already has Windows boot manager installed before via uefi mode.  What you can do now is plug in a bootable usb that has Windows 10 installation media, find it on uefi boot list, which should show as UEFI: USB mass storage device, boot from that usb, do a custom clean install on hdd which involves deleting all old partitions and create new partition,format,enter.  In this procedure because you are in uefi environment, Windows installation  automatically chooses gpt partition when you click “new” to create new partition after manually deleting all old partitions. Need further assistance? Use the "Get Help Now" option at the bottom right to chat with a Dell technician right away.  [IMAGE]  
i cannot boot from hard drive i cannot find it in fast boot menu or in bios it's not appear in boot sequence  i reset tho bios to factroy reset  i changed the bios version to anthor version  i format the hard drive from gpt to mbr  but all this Attempts Failed to boot  so how can i boot or add hard drive to the boot menu  [IMAGE][IMAGE][IMAGE]
hard drive doesn't appear in boot sequence