17 R4, keyboard keys not working, #4

I have the same problem on an otherwise perfect condition Alienware 17 R4.  The "N" key will not function but on a USB keyboard, it works fine.  I did take apart my two previous laptops but have not yet disassembled the Alienware.  This is an expensive laptop so I wonder why the keyboard problems?

System has the Intel i7-7820 cpu.  Also the keyboard does NOT function when booted directly into BIOS (using F2 at startup), thus it's apparently more than a Windows reinstall driver issue.

I've found that sticking the little screws thru a sheet of paper with the panel layout drawn on it helps keeping track of which one goes where.