I love my Surface Pro 3, but in the last week or so I have had a couple of problems. First the external display from the docking station stopped working. It wasn't the cable, as plugging it into the Surface port worked fine. It wasn't the docking station, as I tried it in a second one, and it still didn't work. 

Tried a few suggestions, re-applied a couple of firmware updates, but still no go. I didn't worry as I was able to use the SP3's own port.

Then I was on site, fired up the Surface, and they type cover keyboard didn't work. 

After some judicious searching, I came across some key combinations I hadn't seen before:-

Keyboard not working?

Press the Power button and the Volume Down button at the same time for a few seconds

Keyboard still not working? Accessories on dock not working.

1) Try holding down the Power button and the Volume up button for 15 seconds

2) Wait for 10 seconds

3) Press the power button.

This seems to force the drivers to reload.

One that I already knew, if the Surface won't turn on, try:-

Press and hold the power button for 30 seconds then release. Press the power button and it should fire up.

Another tip useful for developers, stepping through their code, hold down the Fn key and press the Caps key to lock the function keys. Press Fn+Caps again to unlock them.

Fn+Del	Increase screen brightness
Fn+Backspace	Decrease screen brightness
Fn+Spacebar	Places a screenshot of the entire screen or screens onto your Windows clipboard (or fires up Snagit to capture)
Fn+Alt+Spacebar	Places a screenshot of your active window onto your Windows clipboard

Hope this helps someone in the same situation