Windows 8 / 8.1 Boot from DVD

As more Windows 8 / 8.1 computers come in for "help", I've had to deal with the normal issues.
In one case today, I found a Windows 8 laptop that would not boot from DVD (an ASUS K55A)
I might normally test memory and the hard drive that way.
I might normally boot to a Linux variant that way to see how the hardware is acting.
etc.
I might normally boot to a Windows DVD in order to run a repair of the appropriate type.

In this one case I found that there were UEFI (i.e. bios) settings needing change.
In this one case I found that the settings were obscure and couldn't be dealt with in "real time" on site.

Is this common?
Does it carry over into Windows 8.1 necessarily?  Or is it OS independent really (it seems so)?

Does one need to change .iso-based DVDs to UEFI flavor?
Ditto USB sticks for booting?
LVL 27
Fred MarshallPrincipalAsked:
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David Johnson, CD, MVPOwnerCommented:
What you are being hit with is SECURE BOOT which is another way of protecting the operating system.. Get used to it as even some Linux Variants support it. and any system Certified for Windows 8 or newer require secure boot being available, and no firewire ports.
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nobusCommented:
or you may have 2 problems - secure boot setting + bad ram, or bad DVD, or bad drive
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rindiCommented:
UEFI BIOS have new functions that allows the OS to access and change many BIOS settings directly from within the OS's control Panel. Windows 8.x can take advantage of those functions, and other OS's too if the proper utilities are installed.

A further new function that was added to UEFI BIOS by request of m$ is secureboot. This prevents booting to any OS or media that isn't certified.

A further new option of the UEFI BIOS is that product keys are stored inside it, that means when you install the correct OS version that is allowed with that key, you won't have to enter it yourself, and the OS will be activated automatically. So there are no COA stickers anymore.

But on PC's with Secureboot and UEFI BIOS, you can turn both off. Secureboot is often somewhere in a security section of the BIOS, and the change between conventional BIOS mode and UEFI BIOS is often in an advanced section and called something like CSM. But normally things like that are explained in the manual.

You don't need to change your iso's, you just need to turn off secureboot if your iso isn't UEFI certified. Official m$ windows 8.x and upward iso's are automatically UEFI certified. If you have Secureboot turned off in the BIOS you will often see the boot media twice, once with UEFI, and the other without, then you can choose which mode you want to boot from.
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Fred MarshallPrincipalAuthor Commented:
Thanks!  I didn't recognize "CSM" in the system I was dealing with.  And, it required an extra reboot to get the UEFI settings needed:  one boot to get the CSM set and another boot to allow booting from the DVD, etc.
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