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#11
Pressing F12 during boot doesn't get you access to the Boot menu on My Dell laptop.
It should, but you are not alone. Here is a person with the same model Dell that you have: Problem with BIOS at start up in Inspiron 15 - General Hardware - Laptop - Dell Community
F12 should work though. I did find this post:
One thing that seems *very* clear is that the timing of getting both to “Setup” via the F2 key and the “Boot Menu” via the F12 key appears to be extremely critical. It’s not the greatest thing to have to deal with if you are in the process of troubleshooting system problems.