This happens when a password is set for SSD or SSD has hardware encryption enabled that causes a bug in Dell BIOS described here: [URL]
I wanted to protect the laptop for a travel purpose and decided to set a bios password, however it seems that there is no way to do that. I have never touched this section and purchased the laptop new from dell.com so there is no "old password". [IMAGE]
XPS 9710 BIOS Admin Password not available for setup - old and new passwords 
greyed out