Dell Optiplex 755 Windows 10 Pro live-usb Error

Joseph Loo jloo20111002 at
Fri Jul 15 05:13:07 UTC 2016

On 07/14/2016 10:09 PM, Ralf Mardorf wrote:
> On Thu, 14 Jul 2016 19:29:11 -0500, Robert Crawford wrote:
>> My Dell tower has booted from live-usb, now it won't. I get this error
>> "Selected boot device not available".
>> My Dell has 8gb ram, 128gb Samsung SSD Boot Drive, WD 1td data drive.
>> I've checked the usb device settings in the bios everthing is set to
>> "On".
>> When I press F12 for boot menu, I select usb device and get above
>> error with on option is either F1 to try again or F2 to go into bios
>> settings.
>> I create live-usb with this tower. I can boot with one of my laptops
>> (2 run Windows 10 pro, 1 runs Ubuntu 16.04).
> A shot in the dark. Have you ensured a real shutdown of Windows 10, by
> pressing the SHIFT key + clicking on shutdown? AFAIK by default Windows
> 10 doesn't make a real shutdown. I guess it's not related to your
> issue, however, you never knbow.
> Most likely related is the EFI issue.
> You mentioned "BIOS". I'm confused. AFAIK Windows 10 requires U/EFI. I
> suspect simply booting from an USB device could be impossible, resp.
> requires UEFI/secure boot things and some machines might only allow to
> boot from DVD and HDD.
> I didn't read this link myself, but noticed that somebody explained the
> EFI thing:
Is your USB device formatted for uefi compatible? If it is not, the
computer will not boot

Joseph Loo
jloo at

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