wifi Stops Working on Dell Latitude

I have a Dell Latitude laptop courtesy of work.  I run Linux Mint Cinnamon as my OS - which my IT department upgrade to 16GM ram and a 256GB hard disk drive.  I'm generally very, very happy with this system and the only problem I haven't been able to fix, hardware-wise, is when I plug this thing into the Dell docking station, I can't attach two monitors to it like I can when I don't use the docker.

Anyway, good laptop for development, yah?  I enjoy working on this box, even with the 15" screen.

So when the wireless stopped working, I was pretty confused.  I looked for the function+key combination, but the closest I could find, was the switch that tweaks the keyboard back-lighting.  

I hit the blogs and got down a couple rabbit holes installing software (and subsequently de-installing) I didn't need.  Then I found this command: rfkill -- which is a tool for enabling and disabling wireless services.

badLatitude mshallop # rfkill list
0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: yes
1: dell-wifi: Wireless LAN
    Soft blocked: no
    Hard blocked: yes
2: dell-bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: yes
3: nfc0: NFC
    Soft blocked: no
    Hard blocked: no

Hard-blocked?!?

I looked (again) for a fn-key on the keyboard with something that was even remotely close to a wifi symbol - no such luck.

I pick-up the laptop and check the edges and, sure enough, there it is.  A small switch on the right side, next to the headphone jack, that either enables or disables the wireless.  Flipping to the side where red doesn't show re-enabled the wireless and I was back in business.