Ok .. so i'v just built my new PC.. Ryzen 1700x, AMD radeon rx 480, deepcool captain 240ex, asrock motherboard, i have a SSD and an HDD.. also a brand new copy of win 7 pro.. but no Disc drive.. decided to do the bootable usb option.. and i now have the iso on the usb.. but, when i start up, enter bios and see that the usb drive is recognized.. but it boots to a black screen.. nothing at all???