I'll also add that I didn't trash my BIOS to my Thanksgiving gratitude list!
I have a Dell Inspiron 660s. I just upgraded to A13 BIOS. I had a similar but different issue as the person posting their issue in [URL] I was able to get the A13 BIOS setup & boot menus to finally load, but only after following the advice of "Dell-Mohammed S" in that above thread. In other words, I can now get the A13 BIOS menus to load, but only after unplugging my USB printer & 2nd HDMI monitor (it may be one or the other, not both... I haven't narrowed it down yet). So the "Dell-Mohammed S" suggestion of unplugging peripherals WORKED. My Question IS ... Is there some setting within the A13 BIOS that will allow me to leave my peripherals plugged in, rather than be grandfathered into unplugging & replugging cables indefintely. Any help would be greatly appreciated, as I'm sure other have experienced this particular issue.  
A13 BIOS setup menu not loading properly