Thank you for responding and yes, seems no one is able to figure this one out. I am not sure if it will boot from a usb drive, I do not have a windows usb or dvd to check with.
Black screen, with "No bootable devices found"
Press F1 to retry reboot
" F2 reboot into setup
" F5 run onboard diagnostics
Diagnostics check- OK
Bios checked UEFI default
All other DELL recommendations tried...
Thanks and good luck!