[NAME]  UEFI cannot be disabled.  MBR booting is no longer an option past 6th gen skylake.  GPT UEFI is now required as is 64 bit windows. No more CSM  or windows 7 or 8 or 32 bit os.
Followed instructions on dell web site  PC still does not see boot drive.how do I disable UEFI on a dell OptiPlex 7050 micro?Thanks...
disable UEFI