Most likely the reason that you can't boot to USB or DVD is that the USB/DVD isn't using UEFI capable boot settings.
There's several ways around this, depending on what you want to do:
- you can change BIOS settings to disable Secure Boot and enable CSM/legacy boot stuff
- you can obtain disks that are UEFI capable and boot from them. One example of this is Memtest86 (free from here:
Edited by usasma, 23 February 2016 - 05:52 PM.
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