I would try removing "floppy" from the boot-order.
Does your USB-stick light-ujp when it is reading/writing files?
When you try to boot from the USB, does its lamp blink a lot?
When you try to boot from the DVD media, do you hear the disk "spin-up" and make noise?
Is "boot only from UEFI" enabled?
When you power-on, can you press a key to "temporarily select a bootable device" ?