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Change boot sequence

I have a new Dell OptiPlex 7020 desktop. It was upgraded to Windows 10 a few weeks ago. I am trying to boot to the DVD reader but can't.  I start by pressing the F12 at startup.  I get a message at the top right of the screen that says  PREPARING FOR ONE TIME BOOTUP, but then everything looks different. I see NO option to boot to a DVD or CD device. Need help please, Mike

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