Can't boot from DVD on Dell Inspiron 3646

A client of mine has a brand new Dell Inspiron 3646 win 8 PC that he put a windows password on and forgot the password. I have a bootable DVD app that resets the password. I restarted the PC, pressed f12, that goes into the boot manager.  The current boot mode is secure UEFI.  The DVD drive is not listed. If I select Change boot device setting, and select Legacy boot mode, save and reboot, it restarts and says no boot device found.
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Tony GiangrecoAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
does the dvd boot on another system?
does another dvd boot on this system?
did you disable secure boot?
noxchoGlobal Support CoordinatorCommented:
This is protection on UEFI BiOS systems that booting from DVD media is prohibited via Secure Boot. Disable the secure boot and you will get the booting DVD.
Michael DyerSenior Systems Support AnalystCommented:
Here are the steps:

Insert the DVD in the CD/DVD drive.

When you see the Dell logo center of screen, press "F2" continually to enter the Setup Menu.

Click Boot Tab - Secure Boot default is Enabled - needs to be Disabled.

Restart PC at Dell Logo, press F12 to get to Boot Manager Menu - Select DVD.

You should now boot from the DVD
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Tony GiangrecoAuthor Commented:
Seth Simmons: Yes, it boots my Dell Pc and my HP Laptop
noxcho: Yes, I tried that
Michael Dyer: it's F12, not F2 and I already tried that.
here is how to disable secure boot :

if that does not help - try the methods here :
noxchoGlobal Support CoordinatorCommented:
noxcho: Yes, I tried that
Does it mean that SecureBoot is now deactivated? Because you wrote in your original post that SecureBoot is ACTIVATED.
☠ MASQ ☠Commented:
Secure Boot and UEFI > Legacy Boot Options need changing separately
Here's your Menu:
UEFI screen in BIOS setup
Tony GiangrecoAuthor Commented:
They replaced the PC, end of problem.

Thanks for the suggestions.

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Tony GiangrecoAuthor Commented:
The suggestions didn't work and they just replaced the PC. Thanks for the help!
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