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Message: <blockquote data-quote="Bavo" data-source="post: 361166" data-attributes="member: 38782">I'm not an expert in uefi matters: when originally starting the (uefi) bios in the Dell, I only saw the Windows Boot Manager and PXE ipv4 & ipv6 entries as boot options, while the uefi usb stick was inserted. There is an 'add boot option' command button where you can browse for efi boot loaders to add them as boot options (these are *.efi files), so that is what i tried.While trying out boot options and deleting them if they didn't work, that's where i accidently deleted the wrong boot option (Windows Boot Manager).Remark1: the same usb thumb drive does show up in another (non dell) uefi machine as a boot option, so that is what i expected for the Dell machine. (and it proves there is nothing wrong with the boot drive produced by Rufus)Remark2: I understand the uefi boot manager resides in firmware so i fully expected it to show an interface so I'd still at least see the PXE boot options, I know these work because that is how I usually install OS's.  The problem is: nothing shows up after booting, just a blank screen and the two blinking LED's - I'm baffled...Thanks for your reply,BavoRufus: I use it because it's quick and easy</blockquote>